Current Psychiatry

Obesity and overweight, with or without metabolic dysregulation, pose vexing problems for many patients with mood, anxiety, or psychotic disorders. More than one-half of individuals with severe mental illnesses are obese or overweight,¹ resulting from multiple factors that may include psychiatric symptoms (eg, anergia and hyperphagia), poor dietary choices, sedentary lifestyle, underlying inflammatory processes, medical comorbidities, and iatrogenic consequences of certain medications. Unfortunately, numerous psychotropic medications can increase weight and appetite due to a variety of mechanisms, including antihistaminergic effects, direct appetite-stimulating effects, and proclivities to cause insulin resistance. While individual agents can vary, a recent review identified an overall 2-fold increased risk for rapid, significant weight gain during treatment with antipsychotics as a class.² In addition to lifestyle modifications (diet and exercise), many pharmacologic strategies have been proposed to counter iatrogenic weight gain, including appetite suppressants (eg, pro-dopaminergic agents such as phentermine, stimulants, and amantadine), pro-anorectant anticonvulsants (eg, topiramate or zonisamide), opioid receptor antagonists (eg, olanzapine/samidorphan or naltrexone) and oral hypoglycemics such as metformin. However, the magnitude of impact for most of these agents to reverse iatrogenic weight gain tends to be modest, particularly once significant weight gain (ie, ≥7% of initial body weight) has already occurred.

Pharmacologic strategies to modulate or enhance the effects of insulin hold particular importance for combatting psychotropic-associated weight gain. Insulin transports glucose from the intravascular space to end organs for fuel consumption; to varying degrees, second-generation antipsychotics (SGAs) and some other psychotropic medications can cause insulin resistance. This in turn leads to excessive storage of under­utilized glucose in the liver (glycogenesis), the potential for developing fatty liver (ie, nonalcoholic steatohepatitis), and conversion of excess carbohydrates to fatty acids and triglycerides, with subsequent storage in adipose tissue. Medications that can enhance the activity of insulin (so-called incretin mimetics) can help to overcome insulin resistance caused by SGAs (and potentially by other psychotropic medications) and essentially lead to weight loss through enhanced “fuel efficiency.”

Metformin, typically dosed up to 1,000 mg twice daily with meals, has increasingly become recognized as a first-line strategy to attenuate weight gain and glycemic dysregulation from SGAs via its ability to reduce insulin resistance. Yet meta-analyses have shown that although results are significantly better than placebo, overall long-term weight loss from metformin alone tends to be rather modest (<4 kg) and associated with a reduction in body mass index (BMI) of only approximately 1 point.³ Psychiatrists (and other clinicians who prescribe psychotropic medications that can cause weight gain or metabolic dysregulation) therefore need to become familiar with alternative or adjunctive weight loss options. The use of a relatively new class of incretin mimetics called glucagon-like peptide 1 (GLP-1) agonists (Table) has been associated with profound and often dramatic weight loss and improvement of glycemic parameters in patients with obesity and glycemic dysregulation.

What are GLP-1 agonists?

GLP-1 is a hormone secreted by L cells in the intestinal mucosa in response to food. GLP-1 agonists reduce blood sugar by increasing insulin secretion, decreasing glucagon release (thus downregulating further increases in blood sugar), and reducing insulin resistance. GLP-1 agonists also reduce appetite by directly stimulating the satiety center and slowing gastric emptying and GI motility. In addition to GLP-1 agonism, some medications in this family (notably tirzepatide) also agonize a second hormone, glucose-dependent insulinotropic polypeptide, which can further induce insulin secretion as well as decrease stomach acid secretion, potentially delivering an even more substantial reduction in appetite and weight.

Routes of administration and FDA indications

Due to limited bioavailability, most GLP-1 agonists require subcutaneous (SC) injections (the sole exception is the Rybelsus brand of semaglutide, which comes in a daily pill form). Most are FDA-approved not specifically for weight loss but for patients with type 2 diabetes (defined as a hemoglobin A1C ≥6.5% or a fasting blood glucose level ≥126 mg/dL). Weight loss represents a secondary outcome for GLP-1 agonists FDA-approved for glycemic control in patients with type 2 diabetes. The 2 current exceptions to this classification are the Wegovy brand of semaglutide (ie, dosing of 2.4 mg) and the Saxenda brand of liraglutide, both of which carry FDA indications for chronic weight management alone (when paired with dietary and lifestyle modification) in individuals who are obese (BMI >30 kg/m²) regardless of the presence or absence of diabetes, or for persons who are overweight (BMI >27 kg/m²) and have ≥1 weight-related comorbid condition (eg, hypertension, type 2 diabetes, or dyslipidemia). Although patients at risk for diabetes (ie, prediabetes, defined as a hemoglobin A1C 5.7% to 6.4% or a fasting blood glucose level 100 to 125 mg/dL) were included in FDA registration trials of Saxenda or Wegovy, prediabetes is not an FDA indication for any GLP-1 agonist.

Data in weight loss

Most of the existing empirical data on weight loss with GLP-1 agonists come from studies of individuals who are overweight or obese, with or without type 2 diabetes, rather than from studies using these agents to counteract iatrogenic weight gain. In a retrospective cohort study of patients with type 2 diabetes, coadministration with serotonergic antidepressants (eg, citalopram/escitalopram) was associated with attenuation of the weight loss effects of GLP-1 agonists.⁴

Liraglutide currently is the sole GLP-1 agonist studied for treating SGA-associated weight gain. A 16-week randomized trial compared once-daily SC injected liraglutide vs placebo in patients with schizophrenia who incurred weight gain and prediabetes after taking olanzapine or clozapine.⁵ Significantly more patients taking liraglutide than placebo developed normal glucose tolerance (64% vs 16%), and body weight decreased by a mean of 5.3 kg.

Continue to: In studies of semaglutide...

In studies of semaglutide for overweight/obese patients with type 2 diabetes or prediabetes, clinical trials of oral semaglutide (Rybelsus) found a mean weight loss over 26 weeks of -1.0 kg with dosing at 7 mg/d and -2.6 kg with dosing at 14 mg/d.⁶ A 68-week placebo-controlled trial of semaglutide (dosed at 2.4 mg SC weekly) for overweight/obese adults who did not have diabetes yielded a -15.3 kg weight loss (vs -2.6 kg with placebo); one-half of those who received semaglutide lost 15% of their initial body weight (Figure 1A and Figure 1B).⁷ Similar findings with semaglutide 2.4 mg SC weekly (Wegovy) were observed in overweight/obese adolescents, with 73% of participants losing ≥5% of their baseline weight.⁸ A comparative randomized trial in patients with type 2 diabetes also found modestly but significantly greater weight loss with oral semaglutide than with SC liraglutide.⁹

In a 72-week study of tirzepatide specifically for weight loss in nondiabetic patients who were overweight or obese, findings were especially dramatic (Figure 2A and Figure 2B).¹⁰ An overall 15% decrease in body weight was observed with 5 mg/week dosing alongside a 19.5% decrease in body weight with 10 mg/week dosing and a 20.9% weight reduction with 15 mg/week dosing.¹⁰ As noted in Figure 2B, the observed pattern of weight loss occurred along an exponential decay curve. Notably, a comparative study of tirzepatide vs once-weekly semaglutide (1 mg) in patients with type 2 diabetes¹¹ found significantly greater dose-dependent weight loss with tirzepatide than semaglutide (-1.9 kg at 5 mg, -3.6 kg at 10 mg, and -5.5 kg at 15 mg)—although the somewhat low dosing of semaglutide may have limited its optimal possible weight loss benefit.

Tolerability

Adverse effects with GLP-1 agonists are mainly gastrointestinal (eg, nausea, vomiting, abdominal pain, diarrhea, or constipation)^5-11 and generally transient. SC administration is performed in fatty tissue of the abdomen, thigh, or upper arm; site rotation is recommended to minimize injection site pain. All GLP-1 agonists carry manufacturers’ warning and precaution statements identifying the rare potential for acute pancreatitis, acute gall bladder disease, acute kidney injury, and hypoglycemia. Animal studies also have suggested an increased, dose-dependent risk for thyroid C-cell tumors with GLP-1 agonists; this has not been observed in human trials, although postmarketing pharmacovigilance reports have identified cases of medullary thyroid carcinoma in patients who took liraglutide. A manufacturer’s boxed warning indicates that a personal or family history of medullary carcinoma of the thyroid poses a contraindication for taking semaglutide, liraglutide, or tirzepatide.

Initial evidence prompts additional questions

GLP-1 agonists represent an emerging class of novel agents that can modulate glycemic dysregulation and overweight/obesity, often with dramatic results whose magnitude rivals the efficacy of bariatric surgery. Once-weekly formulations of semaglutide (Wegovy) and daily liraglutide (Saxenda) are FDA-approved for weight loss in patients who are overweight or obese while other existing formulations are approved solely for patients with type 2 diabetes, although it is likely that broader indications for weight loss (regardless of glycemic status) are forthcoming. Targeted use of GLP-1 agonists to counteract SGA-associated weight gain is supported by a handful of preliminary reports, with additional studies likely to come. Unanswered questions include:

• When should GLP-1 agonists be considered within a treatment algorithm for iatrogenic weight gain relative to other antidote strategies such as metformin or appetite-suppressing anticonvulsants?
• How effective might GLP-1 agonists be for iatrogenic weight gain from non-SGA psychotropic medications, such as serotonergic antidepressants?
• When and how can GLP-1 agonists be safely coprescribed with other nonincretin mimetic weight loss medications?
• When should psychiatrists prescribe GLP-1 agonists, or do so collaboratively with primary care physicians or endocrinologists, particularly in patients with metabolic syndrome?

Followers of the rapidly emerging literature in this area will likely find themselves best positioned to address these and other questions about optimal management of psychotropic-induced weight gain for the patients they treat.

Bottom Line

The use of glucagon-like peptide 1 (GLP-1) agonists, a relatively new class of incretin mimetics, has been associated with profound and often dramatic weight loss and improvement of glycemic parameters in patients with obesity and glycemic dysregulation. Preliminary reports support the potential targeted use of GLP-1 agonists to counteract weight gain associated with second-generation antipsychotics.

Related Resources

• Singh F, Allen A, Ianni A. Managing metabolic syndrome in patients with schizophrenia. Current Psychiatry. 2020;19(12):20-24,26. doi:10.12788/cp.0064
• Ard J, Fitch A, Fruh S, et al. Weight loss and maintenance related to the mechanism of action of glucagon-like peptide 1 receptor agonists. Adv Ther. 2021;38(6):2821- 2839. doi:10.1007/s12325-021-01710-0

Drug Brand Names

Amantadine • Gocovri
Citalopram • Celexa
Clozapine • Clozaril
Escitalopram • Lexapro
Liraglutide • Victoza, Saxenda
Metformin • Glucophage
Naltrexone • ReVia
Olanzapine • Zyprexa
Olanzapine/samidorphan • Lybalvi
Phentermine • Ionamin
Semaglutide • Rybelsus, Ozempic, Wegovy
Tirzepatide • Mounjaro
Topiramate • Topamax
Zonisamide • Zonegran

Obesity and overweight, with or without metabolic dysregulation, pose vexing problems for many patients with mood, anxiety, or psychotic disorders. More than one-half of individuals with severe mental illnesses are obese or overweight,¹ resulting from multiple factors that may include psychiatric symptoms (eg, anergia and hyperphagia), poor dietary choices, sedentary lifestyle, underlying inflammatory processes, medical comorbidities, and iatrogenic consequences of certain medications. Unfortunately, numerous psychotropic medications can increase weight and appetite due to a variety of mechanisms, including antihistaminergic effects, direct appetite-stimulating effects, and proclivities to cause insulin resistance. While individual agents can vary, a recent review identified an overall 2-fold increased risk for rapid, significant weight gain during treatment with antipsychotics as a class.² In addition to lifestyle modifications (diet and exercise), many pharmacologic strategies have been proposed to counter iatrogenic weight gain, including appetite suppressants (eg, pro-dopaminergic agents such as phentermine, stimulants, and amantadine), pro-anorectant anticonvulsants (eg, topiramate or zonisamide), opioid receptor antagonists (eg, olanzapine/samidorphan or naltrexone) and oral hypoglycemics such as metformin. However, the magnitude of impact for most of these agents to reverse iatrogenic weight gain tends to be modest, particularly once significant weight gain (ie, ≥7% of initial body weight) has already occurred.

Pharmacologic strategies to modulate or enhance the effects of insulin hold particular importance for combatting psychotropic-associated weight gain. Insulin transports glucose from the intravascular space to end organs for fuel consumption; to varying degrees, second-generation antipsychotics (SGAs) and some other psychotropic medications can cause insulin resistance. This in turn leads to excessive storage of under­utilized glucose in the liver (glycogenesis), the potential for developing fatty liver (ie, nonalcoholic steatohepatitis), and conversion of excess carbohydrates to fatty acids and triglycerides, with subsequent storage in adipose tissue. Medications that can enhance the activity of insulin (so-called incretin mimetics) can help to overcome insulin resistance caused by SGAs (and potentially by other psychotropic medications) and essentially lead to weight loss through enhanced “fuel efficiency.”

Metformin, typically dosed up to 1,000 mg twice daily with meals, has increasingly become recognized as a first-line strategy to attenuate weight gain and glycemic dysregulation from SGAs via its ability to reduce insulin resistance. Yet meta-analyses have shown that although results are significantly better than placebo, overall long-term weight loss from metformin alone tends to be rather modest (<4 kg) and associated with a reduction in body mass index (BMI) of only approximately 1 point.³ Psychiatrists (and other clinicians who prescribe psychotropic medications that can cause weight gain or metabolic dysregulation) therefore need to become familiar with alternative or adjunctive weight loss options. The use of a relatively new class of incretin mimetics called glucagon-like peptide 1 (GLP-1) agonists (Table) has been associated with profound and often dramatic weight loss and improvement of glycemic parameters in patients with obesity and glycemic dysregulation.

What are GLP-1 agonists?

GLP-1 is a hormone secreted by L cells in the intestinal mucosa in response to food. GLP-1 agonists reduce blood sugar by increasing insulin secretion, decreasing glucagon release (thus downregulating further increases in blood sugar), and reducing insulin resistance. GLP-1 agonists also reduce appetite by directly stimulating the satiety center and slowing gastric emptying and GI motility. In addition to GLP-1 agonism, some medications in this family (notably tirzepatide) also agonize a second hormone, glucose-dependent insulinotropic polypeptide, which can further induce insulin secretion as well as decrease stomach acid secretion, potentially delivering an even more substantial reduction in appetite and weight.

Routes of administration and FDA indications

Due to limited bioavailability, most GLP-1 agonists require subcutaneous (SC) injections (the sole exception is the Rybelsus brand of semaglutide, which comes in a daily pill form). Most are FDA-approved not specifically for weight loss but for patients with type 2 diabetes (defined as a hemoglobin A1C ≥6.5% or a fasting blood glucose level ≥126 mg/dL). Weight loss represents a secondary outcome for GLP-1 agonists FDA-approved for glycemic control in patients with type 2 diabetes. The 2 current exceptions to this classification are the Wegovy brand of semaglutide (ie, dosing of 2.4 mg) and the Saxenda brand of liraglutide, both of which carry FDA indications for chronic weight management alone (when paired with dietary and lifestyle modification) in individuals who are obese (BMI >30 kg/m²) regardless of the presence or absence of diabetes, or for persons who are overweight (BMI >27 kg/m²) and have ≥1 weight-related comorbid condition (eg, hypertension, type 2 diabetes, or dyslipidemia). Although patients at risk for diabetes (ie, prediabetes, defined as a hemoglobin A1C 5.7% to 6.4% or a fasting blood glucose level 100 to 125 mg/dL) were included in FDA registration trials of Saxenda or Wegovy, prediabetes is not an FDA indication for any GLP-1 agonist.

Data in weight loss

Most of the existing empirical data on weight loss with GLP-1 agonists come from studies of individuals who are overweight or obese, with or without type 2 diabetes, rather than from studies using these agents to counteract iatrogenic weight gain. In a retrospective cohort study of patients with type 2 diabetes, coadministration with serotonergic antidepressants (eg, citalopram/escitalopram) was associated with attenuation of the weight loss effects of GLP-1 agonists.⁴

Liraglutide currently is the sole GLP-1 agonist studied for treating SGA-associated weight gain. A 16-week randomized trial compared once-daily SC injected liraglutide vs placebo in patients with schizophrenia who incurred weight gain and prediabetes after taking olanzapine or clozapine.⁵ Significantly more patients taking liraglutide than placebo developed normal glucose tolerance (64% vs 16%), and body weight decreased by a mean of 5.3 kg.

Continue to: In studies of semaglutide...

In studies of semaglutide for overweight/obese patients with type 2 diabetes or prediabetes, clinical trials of oral semaglutide (Rybelsus) found a mean weight loss over 26 weeks of -1.0 kg with dosing at 7 mg/d and -2.6 kg with dosing at 14 mg/d.⁶ A 68-week placebo-controlled trial of semaglutide (dosed at 2.4 mg SC weekly) for overweight/obese adults who did not have diabetes yielded a -15.3 kg weight loss (vs -2.6 kg with placebo); one-half of those who received semaglutide lost 15% of their initial body weight (Figure 1A and Figure 1B).⁷ Similar findings with semaglutide 2.4 mg SC weekly (Wegovy) were observed in overweight/obese adolescents, with 73% of participants losing ≥5% of their baseline weight.⁸ A comparative randomized trial in patients with type 2 diabetes also found modestly but significantly greater weight loss with oral semaglutide than with SC liraglutide.⁹

In a 72-week study of tirzepatide specifically for weight loss in nondiabetic patients who were overweight or obese, findings were especially dramatic (Figure 2A and Figure 2B).¹⁰ An overall 15% decrease in body weight was observed with 5 mg/week dosing alongside a 19.5% decrease in body weight with 10 mg/week dosing and a 20.9% weight reduction with 15 mg/week dosing.¹⁰ As noted in Figure 2B, the observed pattern of weight loss occurred along an exponential decay curve. Notably, a comparative study of tirzepatide vs once-weekly semaglutide (1 mg) in patients with type 2 diabetes¹¹ found significantly greater dose-dependent weight loss with tirzepatide than semaglutide (-1.9 kg at 5 mg, -3.6 kg at 10 mg, and -5.5 kg at 15 mg)—although the somewhat low dosing of semaglutide may have limited its optimal possible weight loss benefit.

Tolerability

Adverse effects with GLP-1 agonists are mainly gastrointestinal (eg, nausea, vomiting, abdominal pain, diarrhea, or constipation)^5-11 and generally transient. SC administration is performed in fatty tissue of the abdomen, thigh, or upper arm; site rotation is recommended to minimize injection site pain. All GLP-1 agonists carry manufacturers’ warning and precaution statements identifying the rare potential for acute pancreatitis, acute gall bladder disease, acute kidney injury, and hypoglycemia. Animal studies also have suggested an increased, dose-dependent risk for thyroid C-cell tumors with GLP-1 agonists; this has not been observed in human trials, although postmarketing pharmacovigilance reports have identified cases of medullary thyroid carcinoma in patients who took liraglutide. A manufacturer’s boxed warning indicates that a personal or family history of medullary carcinoma of the thyroid poses a contraindication for taking semaglutide, liraglutide, or tirzepatide.

Initial evidence prompts additional questions

GLP-1 agonists represent an emerging class of novel agents that can modulate glycemic dysregulation and overweight/obesity, often with dramatic results whose magnitude rivals the efficacy of bariatric surgery. Once-weekly formulations of semaglutide (Wegovy) and daily liraglutide (Saxenda) are FDA-approved for weight loss in patients who are overweight or obese while other existing formulations are approved solely for patients with type 2 diabetes, although it is likely that broader indications for weight loss (regardless of glycemic status) are forthcoming. Targeted use of GLP-1 agonists to counteract SGA-associated weight gain is supported by a handful of preliminary reports, with additional studies likely to come. Unanswered questions include:

• When should GLP-1 agonists be considered within a treatment algorithm for iatrogenic weight gain relative to other antidote strategies such as metformin or appetite-suppressing anticonvulsants?
• How effective might GLP-1 agonists be for iatrogenic weight gain from non-SGA psychotropic medications, such as serotonergic antidepressants?
• When and how can GLP-1 agonists be safely coprescribed with other nonincretin mimetic weight loss medications?
• When should psychiatrists prescribe GLP-1 agonists, or do so collaboratively with primary care physicians or endocrinologists, particularly in patients with metabolic syndrome?

Followers of the rapidly emerging literature in this area will likely find themselves best positioned to address these and other questions about optimal management of psychotropic-induced weight gain for the patients they treat.

Bottom Line

The use of glucagon-like peptide 1 (GLP-1) agonists, a relatively new class of incretin mimetics, has been associated with profound and often dramatic weight loss and improvement of glycemic parameters in patients with obesity and glycemic dysregulation. Preliminary reports support the potential targeted use of GLP-1 agonists to counteract weight gain associated with second-generation antipsychotics.

Related Resources

• Singh F, Allen A, Ianni A. Managing metabolic syndrome in patients with schizophrenia. Current Psychiatry. 2020;19(12):20-24,26. doi:10.12788/cp.0064
• Ard J, Fitch A, Fruh S, et al. Weight loss and maintenance related to the mechanism of action of glucagon-like peptide 1 receptor agonists. Adv Ther. 2021;38(6):2821- 2839. doi:10.1007/s12325-021-01710-0

Drug Brand Names

Amantadine • Gocovri
Citalopram • Celexa
Clozapine • Clozaril
Escitalopram • Lexapro
Liraglutide • Victoza, Saxenda
Metformin • Glucophage
Naltrexone • ReVia
Olanzapine • Zyprexa
Olanzapine/samidorphan • Lybalvi
Phentermine • Ionamin
Semaglutide • Rybelsus, Ozempic, Wegovy
Tirzepatide • Mounjaro
Topiramate • Topamax
Zonisamide • Zonegran

Obesity and overweight, with or without metabolic dysregulation, pose vexing problems for many patients with mood, anxiety, or psychotic disorders. More than one-half of individuals with severe mental illnesses are obese or overweight,¹ resulting from multiple factors that may include psychiatric symptoms (eg, anergia and hyperphagia), poor dietary choices, sedentary lifestyle, underlying inflammatory processes, medical comorbidities, and iatrogenic consequences of certain medications. Unfortunately, numerous psychotropic medications can increase weight and appetite due to a variety of mechanisms, including antihistaminergic effects, direct appetite-stimulating effects, and proclivities to cause insulin resistance. While individual agents can vary, a recent review identified an overall 2-fold increased risk for rapid, significant weight gain during treatment with antipsychotics as a class.² In addition to lifestyle modifications (diet and exercise), many pharmacologic strategies have been proposed to counter iatrogenic weight gain, including appetite suppressants (eg, pro-dopaminergic agents such as phentermine, stimulants, and amantadine), pro-anorectant anticonvulsants (eg, topiramate or zonisamide), opioid receptor antagonists (eg, olanzapine/samidorphan or naltrexone) and oral hypoglycemics such as metformin. However, the magnitude of impact for most of these agents to reverse iatrogenic weight gain tends to be modest, particularly once significant weight gain (ie, ≥7% of initial body weight) has already occurred.

Pharmacologic strategies to modulate or enhance the effects of insulin hold particular importance for combatting psychotropic-associated weight gain. Insulin transports glucose from the intravascular space to end organs for fuel consumption; to varying degrees, second-generation antipsychotics (SGAs) and some other psychotropic medications can cause insulin resistance. This in turn leads to excessive storage of under­utilized glucose in the liver (glycogenesis), the potential for developing fatty liver (ie, nonalcoholic steatohepatitis), and conversion of excess carbohydrates to fatty acids and triglycerides, with subsequent storage in adipose tissue. Medications that can enhance the activity of insulin (so-called incretin mimetics) can help to overcome insulin resistance caused by SGAs (and potentially by other psychotropic medications) and essentially lead to weight loss through enhanced “fuel efficiency.”

Metformin, typically dosed up to 1,000 mg twice daily with meals, has increasingly become recognized as a first-line strategy to attenuate weight gain and glycemic dysregulation from SGAs via its ability to reduce insulin resistance. Yet meta-analyses have shown that although results are significantly better than placebo, overall long-term weight loss from metformin alone tends to be rather modest (<4 kg) and associated with a reduction in body mass index (BMI) of only approximately 1 point.³ Psychiatrists (and other clinicians who prescribe psychotropic medications that can cause weight gain or metabolic dysregulation) therefore need to become familiar with alternative or adjunctive weight loss options. The use of a relatively new class of incretin mimetics called glucagon-like peptide 1 (GLP-1) agonists (Table) has been associated with profound and often dramatic weight loss and improvement of glycemic parameters in patients with obesity and glycemic dysregulation.

What are GLP-1 agonists?

GLP-1 is a hormone secreted by L cells in the intestinal mucosa in response to food. GLP-1 agonists reduce blood sugar by increasing insulin secretion, decreasing glucagon release (thus downregulating further increases in blood sugar), and reducing insulin resistance. GLP-1 agonists also reduce appetite by directly stimulating the satiety center and slowing gastric emptying and GI motility. In addition to GLP-1 agonism, some medications in this family (notably tirzepatide) also agonize a second hormone, glucose-dependent insulinotropic polypeptide, which can further induce insulin secretion as well as decrease stomach acid secretion, potentially delivering an even more substantial reduction in appetite and weight.

Routes of administration and FDA indications

Due to limited bioavailability, most GLP-1 agonists require subcutaneous (SC) injections (the sole exception is the Rybelsus brand of semaglutide, which comes in a daily pill form). Most are FDA-approved not specifically for weight loss but for patients with type 2 diabetes (defined as a hemoglobin A1C ≥6.5% or a fasting blood glucose level ≥126 mg/dL). Weight loss represents a secondary outcome for GLP-1 agonists FDA-approved for glycemic control in patients with type 2 diabetes. The 2 current exceptions to this classification are the Wegovy brand of semaglutide (ie, dosing of 2.4 mg) and the Saxenda brand of liraglutide, both of which carry FDA indications for chronic weight management alone (when paired with dietary and lifestyle modification) in individuals who are obese (BMI >30 kg/m²) regardless of the presence or absence of diabetes, or for persons who are overweight (BMI >27 kg/m²) and have ≥1 weight-related comorbid condition (eg, hypertension, type 2 diabetes, or dyslipidemia). Although patients at risk for diabetes (ie, prediabetes, defined as a hemoglobin A1C 5.7% to 6.4% or a fasting blood glucose level 100 to 125 mg/dL) were included in FDA registration trials of Saxenda or Wegovy, prediabetes is not an FDA indication for any GLP-1 agonist.

Data in weight loss

Most of the existing empirical data on weight loss with GLP-1 agonists come from studies of individuals who are overweight or obese, with or without type 2 diabetes, rather than from studies using these agents to counteract iatrogenic weight gain. In a retrospective cohort study of patients with type 2 diabetes, coadministration with serotonergic antidepressants (eg, citalopram/escitalopram) was associated with attenuation of the weight loss effects of GLP-1 agonists.⁴

Liraglutide currently is the sole GLP-1 agonist studied for treating SGA-associated weight gain. A 16-week randomized trial compared once-daily SC injected liraglutide vs placebo in patients with schizophrenia who incurred weight gain and prediabetes after taking olanzapine or clozapine.⁵ Significantly more patients taking liraglutide than placebo developed normal glucose tolerance (64% vs 16%), and body weight decreased by a mean of 5.3 kg.

Continue to: In studies of semaglutide...

In studies of semaglutide for overweight/obese patients with type 2 diabetes or prediabetes, clinical trials of oral semaglutide (Rybelsus) found a mean weight loss over 26 weeks of -1.0 kg with dosing at 7 mg/d and -2.6 kg with dosing at 14 mg/d.⁶ A 68-week placebo-controlled trial of semaglutide (dosed at 2.4 mg SC weekly) for overweight/obese adults who did not have diabetes yielded a -15.3 kg weight loss (vs -2.6 kg with placebo); one-half of those who received semaglutide lost 15% of their initial body weight (Figure 1A and Figure 1B).⁷ Similar findings with semaglutide 2.4 mg SC weekly (Wegovy) were observed in overweight/obese adolescents, with 73% of participants losing ≥5% of their baseline weight.⁸ A comparative randomized trial in patients with type 2 diabetes also found modestly but significantly greater weight loss with oral semaglutide than with SC liraglutide.⁹

In a 72-week study of tirzepatide specifically for weight loss in nondiabetic patients who were overweight or obese, findings were especially dramatic (Figure 2A and Figure 2B).¹⁰ An overall 15% decrease in body weight was observed with 5 mg/week dosing alongside a 19.5% decrease in body weight with 10 mg/week dosing and a 20.9% weight reduction with 15 mg/week dosing.¹⁰ As noted in Figure 2B, the observed pattern of weight loss occurred along an exponential decay curve. Notably, a comparative study of tirzepatide vs once-weekly semaglutide (1 mg) in patients with type 2 diabetes¹¹ found significantly greater dose-dependent weight loss with tirzepatide than semaglutide (-1.9 kg at 5 mg, -3.6 kg at 10 mg, and -5.5 kg at 15 mg)—although the somewhat low dosing of semaglutide may have limited its optimal possible weight loss benefit.

Tolerability

Adverse effects with GLP-1 agonists are mainly gastrointestinal (eg, nausea, vomiting, abdominal pain, diarrhea, or constipation)^5-11 and generally transient. SC administration is performed in fatty tissue of the abdomen, thigh, or upper arm; site rotation is recommended to minimize injection site pain. All GLP-1 agonists carry manufacturers’ warning and precaution statements identifying the rare potential for acute pancreatitis, acute gall bladder disease, acute kidney injury, and hypoglycemia. Animal studies also have suggested an increased, dose-dependent risk for thyroid C-cell tumors with GLP-1 agonists; this has not been observed in human trials, although postmarketing pharmacovigilance reports have identified cases of medullary thyroid carcinoma in patients who took liraglutide. A manufacturer’s boxed warning indicates that a personal or family history of medullary carcinoma of the thyroid poses a contraindication for taking semaglutide, liraglutide, or tirzepatide.

Initial evidence prompts additional questions

GLP-1 agonists represent an emerging class of novel agents that can modulate glycemic dysregulation and overweight/obesity, often with dramatic results whose magnitude rivals the efficacy of bariatric surgery. Once-weekly formulations of semaglutide (Wegovy) and daily liraglutide (Saxenda) are FDA-approved for weight loss in patients who are overweight or obese while other existing formulations are approved solely for patients with type 2 diabetes, although it is likely that broader indications for weight loss (regardless of glycemic status) are forthcoming. Targeted use of GLP-1 agonists to counteract SGA-associated weight gain is supported by a handful of preliminary reports, with additional studies likely to come. Unanswered questions include:

• When should GLP-1 agonists be considered within a treatment algorithm for iatrogenic weight gain relative to other antidote strategies such as metformin or appetite-suppressing anticonvulsants?
• How effective might GLP-1 agonists be for iatrogenic weight gain from non-SGA psychotropic medications, such as serotonergic antidepressants?
• When and how can GLP-1 agonists be safely coprescribed with other nonincretin mimetic weight loss medications?
• When should psychiatrists prescribe GLP-1 agonists, or do so collaboratively with primary care physicians or endocrinologists, particularly in patients with metabolic syndrome?

Followers of the rapidly emerging literature in this area will likely find themselves best positioned to address these and other questions about optimal management of psychotropic-induced weight gain for the patients they treat.

Bottom Line

The use of glucagon-like peptide 1 (GLP-1) agonists, a relatively new class of incretin mimetics, has been associated with profound and often dramatic weight loss and improvement of glycemic parameters in patients with obesity and glycemic dysregulation. Preliminary reports support the potential targeted use of GLP-1 agonists to counteract weight gain associated with second-generation antipsychotics.

Related Resources

• Singh F, Allen A, Ianni A. Managing metabolic syndrome in patients with schizophrenia. Current Psychiatry. 2020;19(12):20-24,26. doi:10.12788/cp.0064
• Ard J, Fitch A, Fruh S, et al. Weight loss and maintenance related to the mechanism of action of glucagon-like peptide 1 receptor agonists. Adv Ther. 2021;38(6):2821- 2839. doi:10.1007/s12325-021-01710-0

Drug Brand Names

Amantadine • Gocovri
Citalopram • Celexa
Clozapine • Clozaril
Escitalopram • Lexapro
Liraglutide • Victoza, Saxenda
Metformin • Glucophage
Naltrexone • ReVia
Olanzapine • Zyprexa
Olanzapine/samidorphan • Lybalvi
Phentermine • Ionamin
Semaglutide • Rybelsus, Ozempic, Wegovy
Tirzepatide • Mounjaro
Topiramate • Topamax
Zonisamide • Zonegran

Catatonia is often difficult to identify and treat. The excited catatonia subtype can be particularly challenging to diagnose because it can present with symptoms similar to those seen in mania or psychosis. In this article, we present 3 cases of excited catatonia that illustrate how to identify it, how to treat the catatonia as well as the underlying pathology, and factors to consider during this process to mitigate the risk of adverse outcomes. We also outline a treatment algorithm we used for the 3 cases. Although we describe using this approach for patients with excited catatonia, it is generalizable to other types of catatonia.

Many causes, varying presentations

Catatonia is a psychomotor syndrome characterized by mutism, negativism, stereotypy, waxy flexibility, and other symptoms.¹ It is defined by the presence of ≥3 of the 12 symptoms listed in the Table.² Causes of catatonia include metabolic abnormalities, endocrine disorders, drug intoxication, neurodevelopmental disorders, medication adverse effects, psychosis, and mood disorders.^1,3

A subtype of this syndrome, excited catatonia, can present with restlessness, agitation, emotional lability, poor sleep, and altered mental status in addition to the more typical symptoms.^1,4 Because excited catatonia can resemble mania or psychosis, it is particularly challenging to identify the underlying disorder causing it and appropriate treatment. Fink et al⁴ discussed how clinicians have interpreted the different presentations of excited catatonia to gain insight into the underlying diagnosis. If the patient’s thought process appears disorganized, psychosis may be suspected.⁴ If the patient is delusional and grandiose, they may be manic, and when altered mental status dominates the presentation, delirium may be the culprit.⁴

Regardless of the underlying cause, the first step is to treat the catatonia. Benzodiazepines and electroconvulsive therapy (ECT) are the most well validated treatments for catatonia and have been used to treat excited catatonia.¹ Excited catatonia is often misdiagnosed and subsequently mistreated. In the following 3 cases, excited catatonia was successfully identified and treated using the same approach (Figure).

Case 1

Mr. A, age 27, has a history of bipolar I disorder. He was brought to the hospital by ambulance after being found to be yelling and acting belligerently, and he was admitted to the inpatient psychiatry unit for manic decompensation due to medication nonadherence. He was started on divalproex sodium 500 mg twice a day for mood stabilization, risperidone 1 mg twice a day for adjunct mood stabilization and psychosis, and lorazepam 1 mg 3 times a day for agitation. Mr. A exhibited odd behavior; he would take off his clothes in the hallway, run around the unit, and randomly yell at staff or to himself. At other times, he would stay silent, repeat the same statements, or oddly posture in the hallway for minutes at a time. These behaviors were seen primarily in the hour or 2 preceding lorazepam administration and improved after he received lorazepam.

Mr. A’s treating team completed the Bush-Francis Catatonia Rating Scale (BFCRS), which yielded a positive catatonia screen of 7/14. As a result, divalproex sodium and risperidone were held, and lorazepam was increased to 2 mg twice a day.

After several days, Mr. A was no longer acting oddly and was able to speak more spontaneously; however, he began to exhibit overt signs of mania. He would speak rapidly and make grandiose claims about managing millions of dollars as the CEO of a famous company. Divalproex sodium was restarted at 500 mg twice a day and increased to 500 mg 3 times a day for mood stabilization. Mr. A continued to receive lorazepam 2 mg 3 times a day for catatonia, and risperidone was restarted at 1 mg twice a day to more effectively target his manic symptoms. Risperidone was increased to 2 mg twice a day. After this change, Mr. A’s grandiosity dissipated, his speech normalized, and his thought process became organized. He was discharged on lorazepam 2 mg 3 times a day, divalproex sodium 500 mg 3 times a day, and risperidone 2 mg twice a day. Mr. A’s length of stay (LOS) for this admission was 11 days.

Continue to: Case 2

Case 2

Mr. B, age 49, presented with irritability and odd posturing. He has a history of schizoaffective disorder, bipolar type for which he was receiving a maintenance regimen of lithium 600 mg/d at bedtime and risperidone 2 mg/d at bedtime. He had multiple previous psychiatric admissions for catatonia. On this admission, Mr. B was irritable and difficult to redirect. He yelled at staff members and had a stiff gait. The BFCRS yielded a positive screening score of 3/14 and a severity score of 8/23. As a result, the treatment team conducted a lorazepam challenge.

After Mr. B received lorazepam 1 mg IM, his thought organization and irritability improved, which allowed him to have a coherent conversation with the interviewer. His gait stiffness also improved. His risperidone and lithium were held, and oral lorazepam 1 mg 3 times a day was started for catatonia. Lorazepam was gradually increased to 4 mg 3 times a day. Mr. B became euthymic and redirectable, and had an improved gait. However, he was also tangential and hyperverbal; these symptoms were indicative of the underlying mania that precipitated his catatonia.

Divalproex sodium extended release (ER) was started and increased to 1,500 mg/d at bedtime for mood stabilization. Lithium was restarted and increased to 300 mg twice a day for adjunct mood stabilization. Risperidone was not restarted. Toward the end of his admission, Mr. B was noted to be overly sedated, so the lorazepam dosage was decreased. He was discharged on lorazepam 2 mg 3 times a day, divalproex sodium ER 1,500 mg/d at bedtime, and lithium 300 mg twice a day. At discharge, Mr. B was calm and euthymic, with a linear thought process. His LOS was 25 days.

Case 3

Mr. C, age 62, presented to the emergency department (ED) because he had exhibited erratic behavior and had not slept for the past week. He has a history of bipolar I disorder, hypothyroidism, diabetes, and hypertension. For many years, he had been stable on divalproex sodium ER 2,500 mg/d at bedtime for mood stabilization and clozapine 100 mg/d at bedtime for adjunct mood stabilization and psychosis. In the ED, Mr. C was irritable, distractible, and tangential. On admission, he was speaking slowly with increased speech latency in response to questions, exhibiting stereotypy, repeating statements over and over, and walking very slowly.

The BFCRS yielded a positive screening score of 5/14 and a severity score of 10/23. Lorazepam 1 mg IM was administered. After 15 minutes, Mr. C’s speech, gait, and distractibility improved. As a result, clozapine and divalproex sodium were held, and he was started on oral lorazepam 1 mg 3 times a day. After several days, Mr. C was speaking fluently and no longer exhibiting stereotypy or having outbursts where he would make repetitive statements. However, he was tangential and irritable at times, which were signs of his underlying mania. Divalproex sodium ER was restarted at 250 mg/d at bedtime for mood stabilization and gradually increased to 2,500 mg/d at bedtime. Clozapine was also restarted at 25 mg/d at bedtime and gradually increased to 200 mg/d at bedtime. The lorazepam was gradually tapered and discontinued over the course of 3 weeks due to oversedation.

Continue to: At discharge...

At discharge, Mr. C was euthymic, calm, linear, and goal-directed. He was discharged on divalproex sodium ER 2,500 mg/d at bedtime and clozapine 200 mg/d at bedtime. His LOS for this admission was 22 days.

A stepwise approach can improve outcomes

The Figure outlines the method we used to manage excited catatonia in these 3 cases. Each of these patients exhibited signs of excited catatonia, but because those symptoms were nearly identical to those of mania, it was initially difficult to identify catatonia. Excited catatonia was suspected after more typical catatonic symptoms—such as a stiff gait, slowed speech, and stereotypy—were observed. The BFCRS was completed to get an objective measure of the likelihood that the patient was catatonic. In all 3 cases, the BFCRS resulted in a positive screen for catatonia. Following this, the patients described in Case 2 and Case 3 received a lorazepam challenge, which confirmed their catatonia. No lorazepam challenge was performed in Case 1 because the patient was already receiving lorazepam when the BFCRS was completed. Although most catatonic patients will respond to a lorazepam challenge, not all will. Therefore, clinicians should maintain some degree of suspicion for catatonia if a patient has a positive screen on the BFCRS but a negative lorazepam challenge.

In all 3 cases, after catatonia was confirmed, the patient’s psychotropic medications were discontinued. In all 3 cases, the antipsychotic was held to prevent progression to neuroleptic malignant syndrome (NMS) or malignant catatonia. Rasmussen et al³ found that 3.6% of the catatonic patients in their sample who were treated with antipsychotics developed NMS. A review of prospective studies looking at patients treated with antipsychotics found the incidence of NMS was .07% to 1.8%.⁵ Because NMS is often clinically indistinguishable from malignant catatonia,^4,6 this incidence of NMS may have represented an increased incidence in malignant catatonia.

In all 3 cases, the mood stabilizer was held to prevent it from complicating the clinical picture. Discontinuing the mood stabilizer and focusing on treating the catatonia before targeting the underlying mania increased the likelihood of differentiating the patient’s catatonic symptoms from manic symptoms. This resulted in more precise medication selection and titration by allowing us to identify the specific symptoms that were being targeted by each medication.

Oral lorazepam was prescribed to target catatonia in all 3 cases, and the dosage was gradually increased until symptoms began to resolve. As the catatonia resolved, the manic symptoms became more easily identifiable, and at this point a mood stabilizer was started and titrated to a therapeutic dose to target the mania. In Case 1 and Case 3, the antipsychotic was restarted to treat the mania more effectively. It was not restarted in Case 2 because the patient’s mania was effectively being managed by 2 mood stabilizers. The risks and benefits of starting an antipsychotic in a catatonic or recently catatonic patient should be carefully considered. In the 2 cases where the antipsychotic was restarted, the patients were closely monitored, and there were no signs of NMS or malignant catatonia.

Continue to: As discharge approached...

As discharge approached, the dosages of oral lorazepam were reevaluated. Catatonic patients can typically tolerate high doses of benzodiazepines without becoming overly sedated, but each patient has a different threshold at which the dosage causes oversedation. In all 3 patients, lorazepam was initially titrated to a dose that treated their catatonic symptoms without causing intolerable sedation. In Case 2 and Case 3, as the catatonia began to resolve, the patients became increasingly sedated on their existing lorazepam dosage, so it was decreased. Because the patient in Case 1 did not become overly sedated, his lorazepam dosage did not need to be reduced.

For 2 of these patients, our approach resulted in a shorter LOS compared to their previous hospitalizations. The LOS in Case 2 was 25 days; 5 years earlier, he had a 49-day LOS for mania and catatonia. During the past admission, the identification and treatment of the catatonia was delayed, which resulted in the patient requiring multiple transfers to the medical unit for unstable vital signs. The LOS in Case 3 was 22 days; 6 months prior to this admission, the patient had 2 psychiatric admissions that totaled 37 days. Although the patient’s presentation in the 2 previous admissions was similar to his presentation as described in Case 3, catatonia had not been identified or treated in either admission. Since his catatonia and mania were treated in Case 3, he has not required a readmission. The patient in Case 1 was previously hospitalized, but information about the LOS of these admissions was not available. These results suggest that early identification and treatment of catatonia via the approach we used can improve patient outcomes.

Bottom Line

Excited catatonia can be challenging to diagnose and treat because it can present with symptoms similar to those seen in mania or psychosis. We describe 3 cases in which we used a stepwise approach to optimize treatment and improve outcomes for patients with excited catatonia. This approach may work equally well for other catatonia subtypes.

Related Resources

• Dubovsky SL, Dubovsky AN. Catatonia: how to identify and treat it. Current Psychiatry. 2018;17(8):16-26.
• Crouse EL, Joel B. Moran JB. Catatonia: recognition, management, and prevention of complications. Current Psychiatry. 2018;17(12):45-49.

Drug Brand Names

Clozapine • Clozaril
Lithium • Eskalith, Lithobid
Lorazepam • Ativan
Risperidone • Risperdal
Divalproex sodium • Depakote

Catatonia is often difficult to identify and treat. The excited catatonia subtype can be particularly challenging to diagnose because it can present with symptoms similar to those seen in mania or psychosis. In this article, we present 3 cases of excited catatonia that illustrate how to identify it, how to treat the catatonia as well as the underlying pathology, and factors to consider during this process to mitigate the risk of adverse outcomes. We also outline a treatment algorithm we used for the 3 cases. Although we describe using this approach for patients with excited catatonia, it is generalizable to other types of catatonia.

Many causes, varying presentations

Catatonia is a psychomotor syndrome characterized by mutism, negativism, stereotypy, waxy flexibility, and other symptoms.¹ It is defined by the presence of ≥3 of the 12 symptoms listed in the Table.² Causes of catatonia include metabolic abnormalities, endocrine disorders, drug intoxication, neurodevelopmental disorders, medication adverse effects, psychosis, and mood disorders.^1,3

A subtype of this syndrome, excited catatonia, can present with restlessness, agitation, emotional lability, poor sleep, and altered mental status in addition to the more typical symptoms.^1,4 Because excited catatonia can resemble mania or psychosis, it is particularly challenging to identify the underlying disorder causing it and appropriate treatment. Fink et al⁴ discussed how clinicians have interpreted the different presentations of excited catatonia to gain insight into the underlying diagnosis. If the patient’s thought process appears disorganized, psychosis may be suspected.⁴ If the patient is delusional and grandiose, they may be manic, and when altered mental status dominates the presentation, delirium may be the culprit.⁴

Regardless of the underlying cause, the first step is to treat the catatonia. Benzodiazepines and electroconvulsive therapy (ECT) are the most well validated treatments for catatonia and have been used to treat excited catatonia.¹ Excited catatonia is often misdiagnosed and subsequently mistreated. In the following 3 cases, excited catatonia was successfully identified and treated using the same approach (Figure).

Case 1

Mr. A, age 27, has a history of bipolar I disorder. He was brought to the hospital by ambulance after being found to be yelling and acting belligerently, and he was admitted to the inpatient psychiatry unit for manic decompensation due to medication nonadherence. He was started on divalproex sodium 500 mg twice a day for mood stabilization, risperidone 1 mg twice a day for adjunct mood stabilization and psychosis, and lorazepam 1 mg 3 times a day for agitation. Mr. A exhibited odd behavior; he would take off his clothes in the hallway, run around the unit, and randomly yell at staff or to himself. At other times, he would stay silent, repeat the same statements, or oddly posture in the hallway for minutes at a time. These behaviors were seen primarily in the hour or 2 preceding lorazepam administration and improved after he received lorazepam.

Mr. A’s treating team completed the Bush-Francis Catatonia Rating Scale (BFCRS), which yielded a positive catatonia screen of 7/14. As a result, divalproex sodium and risperidone were held, and lorazepam was increased to 2 mg twice a day.

After several days, Mr. A was no longer acting oddly and was able to speak more spontaneously; however, he began to exhibit overt signs of mania. He would speak rapidly and make grandiose claims about managing millions of dollars as the CEO of a famous company. Divalproex sodium was restarted at 500 mg twice a day and increased to 500 mg 3 times a day for mood stabilization. Mr. A continued to receive lorazepam 2 mg 3 times a day for catatonia, and risperidone was restarted at 1 mg twice a day to more effectively target his manic symptoms. Risperidone was increased to 2 mg twice a day. After this change, Mr. A’s grandiosity dissipated, his speech normalized, and his thought process became organized. He was discharged on lorazepam 2 mg 3 times a day, divalproex sodium 500 mg 3 times a day, and risperidone 2 mg twice a day. Mr. A’s length of stay (LOS) for this admission was 11 days.

Continue to: Case 2

Case 2

Mr. B, age 49, presented with irritability and odd posturing. He has a history of schizoaffective disorder, bipolar type for which he was receiving a maintenance regimen of lithium 600 mg/d at bedtime and risperidone 2 mg/d at bedtime. He had multiple previous psychiatric admissions for catatonia. On this admission, Mr. B was irritable and difficult to redirect. He yelled at staff members and had a stiff gait. The BFCRS yielded a positive screening score of 3/14 and a severity score of 8/23. As a result, the treatment team conducted a lorazepam challenge.

After Mr. B received lorazepam 1 mg IM, his thought organization and irritability improved, which allowed him to have a coherent conversation with the interviewer. His gait stiffness also improved. His risperidone and lithium were held, and oral lorazepam 1 mg 3 times a day was started for catatonia. Lorazepam was gradually increased to 4 mg 3 times a day. Mr. B became euthymic and redirectable, and had an improved gait. However, he was also tangential and hyperverbal; these symptoms were indicative of the underlying mania that precipitated his catatonia.

Divalproex sodium extended release (ER) was started and increased to 1,500 mg/d at bedtime for mood stabilization. Lithium was restarted and increased to 300 mg twice a day for adjunct mood stabilization. Risperidone was not restarted. Toward the end of his admission, Mr. B was noted to be overly sedated, so the lorazepam dosage was decreased. He was discharged on lorazepam 2 mg 3 times a day, divalproex sodium ER 1,500 mg/d at bedtime, and lithium 300 mg twice a day. At discharge, Mr. B was calm and euthymic, with a linear thought process. His LOS was 25 days.

Case 3

Mr. C, age 62, presented to the emergency department (ED) because he had exhibited erratic behavior and had not slept for the past week. He has a history of bipolar I disorder, hypothyroidism, diabetes, and hypertension. For many years, he had been stable on divalproex sodium ER 2,500 mg/d at bedtime for mood stabilization and clozapine 100 mg/d at bedtime for adjunct mood stabilization and psychosis. In the ED, Mr. C was irritable, distractible, and tangential. On admission, he was speaking slowly with increased speech latency in response to questions, exhibiting stereotypy, repeating statements over and over, and walking very slowly.

The BFCRS yielded a positive screening score of 5/14 and a severity score of 10/23. Lorazepam 1 mg IM was administered. After 15 minutes, Mr. C’s speech, gait, and distractibility improved. As a result, clozapine and divalproex sodium were held, and he was started on oral lorazepam 1 mg 3 times a day. After several days, Mr. C was speaking fluently and no longer exhibiting stereotypy or having outbursts where he would make repetitive statements. However, he was tangential and irritable at times, which were signs of his underlying mania. Divalproex sodium ER was restarted at 250 mg/d at bedtime for mood stabilization and gradually increased to 2,500 mg/d at bedtime. Clozapine was also restarted at 25 mg/d at bedtime and gradually increased to 200 mg/d at bedtime. The lorazepam was gradually tapered and discontinued over the course of 3 weeks due to oversedation.

Continue to: At discharge...

At discharge, Mr. C was euthymic, calm, linear, and goal-directed. He was discharged on divalproex sodium ER 2,500 mg/d at bedtime and clozapine 200 mg/d at bedtime. His LOS for this admission was 22 days.

A stepwise approach can improve outcomes

The Figure outlines the method we used to manage excited catatonia in these 3 cases. Each of these patients exhibited signs of excited catatonia, but because those symptoms were nearly identical to those of mania, it was initially difficult to identify catatonia. Excited catatonia was suspected after more typical catatonic symptoms—such as a stiff gait, slowed speech, and stereotypy—were observed. The BFCRS was completed to get an objective measure of the likelihood that the patient was catatonic. In all 3 cases, the BFCRS resulted in a positive screen for catatonia. Following this, the patients described in Case 2 and Case 3 received a lorazepam challenge, which confirmed their catatonia. No lorazepam challenge was performed in Case 1 because the patient was already receiving lorazepam when the BFCRS was completed. Although most catatonic patients will respond to a lorazepam challenge, not all will. Therefore, clinicians should maintain some degree of suspicion for catatonia if a patient has a positive screen on the BFCRS but a negative lorazepam challenge.

In all 3 cases, after catatonia was confirmed, the patient’s psychotropic medications were discontinued. In all 3 cases, the antipsychotic was held to prevent progression to neuroleptic malignant syndrome (NMS) or malignant catatonia. Rasmussen et al³ found that 3.6% of the catatonic patients in their sample who were treated with antipsychotics developed NMS. A review of prospective studies looking at patients treated with antipsychotics found the incidence of NMS was .07% to 1.8%.⁵ Because NMS is often clinically indistinguishable from malignant catatonia,^4,6 this incidence of NMS may have represented an increased incidence in malignant catatonia.

In all 3 cases, the mood stabilizer was held to prevent it from complicating the clinical picture. Discontinuing the mood stabilizer and focusing on treating the catatonia before targeting the underlying mania increased the likelihood of differentiating the patient’s catatonic symptoms from manic symptoms. This resulted in more precise medication selection and titration by allowing us to identify the specific symptoms that were being targeted by each medication.

Oral lorazepam was prescribed to target catatonia in all 3 cases, and the dosage was gradually increased until symptoms began to resolve. As the catatonia resolved, the manic symptoms became more easily identifiable, and at this point a mood stabilizer was started and titrated to a therapeutic dose to target the mania. In Case 1 and Case 3, the antipsychotic was restarted to treat the mania more effectively. It was not restarted in Case 2 because the patient’s mania was effectively being managed by 2 mood stabilizers. The risks and benefits of starting an antipsychotic in a catatonic or recently catatonic patient should be carefully considered. In the 2 cases where the antipsychotic was restarted, the patients were closely monitored, and there were no signs of NMS or malignant catatonia.

Continue to: As discharge approached...

As discharge approached, the dosages of oral lorazepam were reevaluated. Catatonic patients can typically tolerate high doses of benzodiazepines without becoming overly sedated, but each patient has a different threshold at which the dosage causes oversedation. In all 3 patients, lorazepam was initially titrated to a dose that treated their catatonic symptoms without causing intolerable sedation. In Case 2 and Case 3, as the catatonia began to resolve, the patients became increasingly sedated on their existing lorazepam dosage, so it was decreased. Because the patient in Case 1 did not become overly sedated, his lorazepam dosage did not need to be reduced.

For 2 of these patients, our approach resulted in a shorter LOS compared to their previous hospitalizations. The LOS in Case 2 was 25 days; 5 years earlier, he had a 49-day LOS for mania and catatonia. During the past admission, the identification and treatment of the catatonia was delayed, which resulted in the patient requiring multiple transfers to the medical unit for unstable vital signs. The LOS in Case 3 was 22 days; 6 months prior to this admission, the patient had 2 psychiatric admissions that totaled 37 days. Although the patient’s presentation in the 2 previous admissions was similar to his presentation as described in Case 3, catatonia had not been identified or treated in either admission. Since his catatonia and mania were treated in Case 3, he has not required a readmission. The patient in Case 1 was previously hospitalized, but information about the LOS of these admissions was not available. These results suggest that early identification and treatment of catatonia via the approach we used can improve patient outcomes.

Bottom Line

Excited catatonia can be challenging to diagnose and treat because it can present with symptoms similar to those seen in mania or psychosis. We describe 3 cases in which we used a stepwise approach to optimize treatment and improve outcomes for patients with excited catatonia. This approach may work equally well for other catatonia subtypes.

Related Resources

• Dubovsky SL, Dubovsky AN. Catatonia: how to identify and treat it. Current Psychiatry. 2018;17(8):16-26.
• Crouse EL, Joel B. Moran JB. Catatonia: recognition, management, and prevention of complications. Current Psychiatry. 2018;17(12):45-49.

Drug Brand Names

Clozapine • Clozaril
Lithium • Eskalith, Lithobid
Lorazepam • Ativan
Risperidone • Risperdal
Divalproex sodium • Depakote

Catatonia is often difficult to identify and treat. The excited catatonia subtype can be particularly challenging to diagnose because it can present with symptoms similar to those seen in mania or psychosis. In this article, we present 3 cases of excited catatonia that illustrate how to identify it, how to treat the catatonia as well as the underlying pathology, and factors to consider during this process to mitigate the risk of adverse outcomes. We also outline a treatment algorithm we used for the 3 cases. Although we describe using this approach for patients with excited catatonia, it is generalizable to other types of catatonia.

Many causes, varying presentations

Catatonia is a psychomotor syndrome characterized by mutism, negativism, stereotypy, waxy flexibility, and other symptoms.¹ It is defined by the presence of ≥3 of the 12 symptoms listed in the Table.² Causes of catatonia include metabolic abnormalities, endocrine disorders, drug intoxication, neurodevelopmental disorders, medication adverse effects, psychosis, and mood disorders.^1,3

A subtype of this syndrome, excited catatonia, can present with restlessness, agitation, emotional lability, poor sleep, and altered mental status in addition to the more typical symptoms.^1,4 Because excited catatonia can resemble mania or psychosis, it is particularly challenging to identify the underlying disorder causing it and appropriate treatment. Fink et al⁴ discussed how clinicians have interpreted the different presentations of excited catatonia to gain insight into the underlying diagnosis. If the patient’s thought process appears disorganized, psychosis may be suspected.⁴ If the patient is delusional and grandiose, they may be manic, and when altered mental status dominates the presentation, delirium may be the culprit.⁴

Regardless of the underlying cause, the first step is to treat the catatonia. Benzodiazepines and electroconvulsive therapy (ECT) are the most well validated treatments for catatonia and have been used to treat excited catatonia.¹ Excited catatonia is often misdiagnosed and subsequently mistreated. In the following 3 cases, excited catatonia was successfully identified and treated using the same approach (Figure).

Case 1

Mr. A, age 27, has a history of bipolar I disorder. He was brought to the hospital by ambulance after being found to be yelling and acting belligerently, and he was admitted to the inpatient psychiatry unit for manic decompensation due to medication nonadherence. He was started on divalproex sodium 500 mg twice a day for mood stabilization, risperidone 1 mg twice a day for adjunct mood stabilization and psychosis, and lorazepam 1 mg 3 times a day for agitation. Mr. A exhibited odd behavior; he would take off his clothes in the hallway, run around the unit, and randomly yell at staff or to himself. At other times, he would stay silent, repeat the same statements, or oddly posture in the hallway for minutes at a time. These behaviors were seen primarily in the hour or 2 preceding lorazepam administration and improved after he received lorazepam.

Mr. A’s treating team completed the Bush-Francis Catatonia Rating Scale (BFCRS), which yielded a positive catatonia screen of 7/14. As a result, divalproex sodium and risperidone were held, and lorazepam was increased to 2 mg twice a day.

After several days, Mr. A was no longer acting oddly and was able to speak more spontaneously; however, he began to exhibit overt signs of mania. He would speak rapidly and make grandiose claims about managing millions of dollars as the CEO of a famous company. Divalproex sodium was restarted at 500 mg twice a day and increased to 500 mg 3 times a day for mood stabilization. Mr. A continued to receive lorazepam 2 mg 3 times a day for catatonia, and risperidone was restarted at 1 mg twice a day to more effectively target his manic symptoms. Risperidone was increased to 2 mg twice a day. After this change, Mr. A’s grandiosity dissipated, his speech normalized, and his thought process became organized. He was discharged on lorazepam 2 mg 3 times a day, divalproex sodium 500 mg 3 times a day, and risperidone 2 mg twice a day. Mr. A’s length of stay (LOS) for this admission was 11 days.

Continue to: Case 2

Case 2

Mr. B, age 49, presented with irritability and odd posturing. He has a history of schizoaffective disorder, bipolar type for which he was receiving a maintenance regimen of lithium 600 mg/d at bedtime and risperidone 2 mg/d at bedtime. He had multiple previous psychiatric admissions for catatonia. On this admission, Mr. B was irritable and difficult to redirect. He yelled at staff members and had a stiff gait. The BFCRS yielded a positive screening score of 3/14 and a severity score of 8/23. As a result, the treatment team conducted a lorazepam challenge.

After Mr. B received lorazepam 1 mg IM, his thought organization and irritability improved, which allowed him to have a coherent conversation with the interviewer. His gait stiffness also improved. His risperidone and lithium were held, and oral lorazepam 1 mg 3 times a day was started for catatonia. Lorazepam was gradually increased to 4 mg 3 times a day. Mr. B became euthymic and redirectable, and had an improved gait. However, he was also tangential and hyperverbal; these symptoms were indicative of the underlying mania that precipitated his catatonia.

Divalproex sodium extended release (ER) was started and increased to 1,500 mg/d at bedtime for mood stabilization. Lithium was restarted and increased to 300 mg twice a day for adjunct mood stabilization. Risperidone was not restarted. Toward the end of his admission, Mr. B was noted to be overly sedated, so the lorazepam dosage was decreased. He was discharged on lorazepam 2 mg 3 times a day, divalproex sodium ER 1,500 mg/d at bedtime, and lithium 300 mg twice a day. At discharge, Mr. B was calm and euthymic, with a linear thought process. His LOS was 25 days.

Case 3

Mr. C, age 62, presented to the emergency department (ED) because he had exhibited erratic behavior and had not slept for the past week. He has a history of bipolar I disorder, hypothyroidism, diabetes, and hypertension. For many years, he had been stable on divalproex sodium ER 2,500 mg/d at bedtime for mood stabilization and clozapine 100 mg/d at bedtime for adjunct mood stabilization and psychosis. In the ED, Mr. C was irritable, distractible, and tangential. On admission, he was speaking slowly with increased speech latency in response to questions, exhibiting stereotypy, repeating statements over and over, and walking very slowly.

The BFCRS yielded a positive screening score of 5/14 and a severity score of 10/23. Lorazepam 1 mg IM was administered. After 15 minutes, Mr. C’s speech, gait, and distractibility improved. As a result, clozapine and divalproex sodium were held, and he was started on oral lorazepam 1 mg 3 times a day. After several days, Mr. C was speaking fluently and no longer exhibiting stereotypy or having outbursts where he would make repetitive statements. However, he was tangential and irritable at times, which were signs of his underlying mania. Divalproex sodium ER was restarted at 250 mg/d at bedtime for mood stabilization and gradually increased to 2,500 mg/d at bedtime. Clozapine was also restarted at 25 mg/d at bedtime and gradually increased to 200 mg/d at bedtime. The lorazepam was gradually tapered and discontinued over the course of 3 weeks due to oversedation.

Continue to: At discharge...

At discharge, Mr. C was euthymic, calm, linear, and goal-directed. He was discharged on divalproex sodium ER 2,500 mg/d at bedtime and clozapine 200 mg/d at bedtime. His LOS for this admission was 22 days.

A stepwise approach can improve outcomes

The Figure outlines the method we used to manage excited catatonia in these 3 cases. Each of these patients exhibited signs of excited catatonia, but because those symptoms were nearly identical to those of mania, it was initially difficult to identify catatonia. Excited catatonia was suspected after more typical catatonic symptoms—such as a stiff gait, slowed speech, and stereotypy—were observed. The BFCRS was completed to get an objective measure of the likelihood that the patient was catatonic. In all 3 cases, the BFCRS resulted in a positive screen for catatonia. Following this, the patients described in Case 2 and Case 3 received a lorazepam challenge, which confirmed their catatonia. No lorazepam challenge was performed in Case 1 because the patient was already receiving lorazepam when the BFCRS was completed. Although most catatonic patients will respond to a lorazepam challenge, not all will. Therefore, clinicians should maintain some degree of suspicion for catatonia if a patient has a positive screen on the BFCRS but a negative lorazepam challenge.

In all 3 cases, after catatonia was confirmed, the patient’s psychotropic medications were discontinued. In all 3 cases, the antipsychotic was held to prevent progression to neuroleptic malignant syndrome (NMS) or malignant catatonia. Rasmussen et al³ found that 3.6% of the catatonic patients in their sample who were treated with antipsychotics developed NMS. A review of prospective studies looking at patients treated with antipsychotics found the incidence of NMS was .07% to 1.8%.⁵ Because NMS is often clinically indistinguishable from malignant catatonia,^4,6 this incidence of NMS may have represented an increased incidence in malignant catatonia.

In all 3 cases, the mood stabilizer was held to prevent it from complicating the clinical picture. Discontinuing the mood stabilizer and focusing on treating the catatonia before targeting the underlying mania increased the likelihood of differentiating the patient’s catatonic symptoms from manic symptoms. This resulted in more precise medication selection and titration by allowing us to identify the specific symptoms that were being targeted by each medication.

Oral lorazepam was prescribed to target catatonia in all 3 cases, and the dosage was gradually increased until symptoms began to resolve. As the catatonia resolved, the manic symptoms became more easily identifiable, and at this point a mood stabilizer was started and titrated to a therapeutic dose to target the mania. In Case 1 and Case 3, the antipsychotic was restarted to treat the mania more effectively. It was not restarted in Case 2 because the patient’s mania was effectively being managed by 2 mood stabilizers. The risks and benefits of starting an antipsychotic in a catatonic or recently catatonic patient should be carefully considered. In the 2 cases where the antipsychotic was restarted, the patients were closely monitored, and there were no signs of NMS or malignant catatonia.

Continue to: As discharge approached...

As discharge approached, the dosages of oral lorazepam were reevaluated. Catatonic patients can typically tolerate high doses of benzodiazepines without becoming overly sedated, but each patient has a different threshold at which the dosage causes oversedation. In all 3 patients, lorazepam was initially titrated to a dose that treated their catatonic symptoms without causing intolerable sedation. In Case 2 and Case 3, as the catatonia began to resolve, the patients became increasingly sedated on their existing lorazepam dosage, so it was decreased. Because the patient in Case 1 did not become overly sedated, his lorazepam dosage did not need to be reduced.

For 2 of these patients, our approach resulted in a shorter LOS compared to their previous hospitalizations. The LOS in Case 2 was 25 days; 5 years earlier, he had a 49-day LOS for mania and catatonia. During the past admission, the identification and treatment of the catatonia was delayed, which resulted in the patient requiring multiple transfers to the medical unit for unstable vital signs. The LOS in Case 3 was 22 days; 6 months prior to this admission, the patient had 2 psychiatric admissions that totaled 37 days. Although the patient’s presentation in the 2 previous admissions was similar to his presentation as described in Case 3, catatonia had not been identified or treated in either admission. Since his catatonia and mania were treated in Case 3, he has not required a readmission. The patient in Case 1 was previously hospitalized, but information about the LOS of these admissions was not available. These results suggest that early identification and treatment of catatonia via the approach we used can improve patient outcomes.

Bottom Line

Excited catatonia can be challenging to diagnose and treat because it can present with symptoms similar to those seen in mania or psychosis. We describe 3 cases in which we used a stepwise approach to optimize treatment and improve outcomes for patients with excited catatonia. This approach may work equally well for other catatonia subtypes.

Related Resources

• Dubovsky SL, Dubovsky AN. Catatonia: how to identify and treat it. Current Psychiatry. 2018;17(8):16-26.
• Crouse EL, Joel B. Moran JB. Catatonia: recognition, management, and prevention of complications. Current Psychiatry. 2018;17(12):45-49.

Drug Brand Names

Clozapine • Clozaril
Lithium • Eskalith, Lithobid
Lorazepam • Ativan
Risperidone • Risperdal
Divalproex sodium • Depakote

Psychedelics are a class of substances known to produce alterations in consciousness and perception. In the last 2 decades, psychedelic research has garnered increasing attention from scientists, therapists, entrepreneurs, and the public. While many of these compounds remain illegal in the United States and in many parts of the world (Box¹), a recent resurrection of psychedelic research has motivated the FDA to designate multiple psychedelic compounds as “breakthrough therapies,” thereby expediting the investigation, development, and review of psychedelic treatments.

Box

There is growing evidence that psychedelics may be efficacious for treating a range of psychiatric disorders. Potential clinical indications for psychedelics include some forms of depression, posttraumatic stress disorder (PTSD), and substance use disorders (Table 1^2,3). In most instances, the clinical use of psychedelics is being investigated and offered in the context of psychedelic-assisted psychotherapy, though ketamine is a prominent exception. Ketamine and esketamine are already being used to treat depression, and FDA approval is anticipated for other psychedelics. An examination of the safety considerations of psychedelics for the treatment of psychiatric disorders is therefore highly relevant and timely.

This article examines the adverse effect profile of classical (psilocybin [“mushrooms”], lysergic acid diethylamide [LSD], and N,N-dimethyltryptamine [DMT]/ayahuasca) and nonclassical (the entactogen 3,4-methylenedioxymethamphetamine [MDMA, known as “ecstasy”] and the dissociative anesthetic ketamine) psychedelics.

Psilocybin

Psilocybin is typically administered as a single dose of 10 to 30 mg and used in conjunction with preintegration and postintegration psychotherapy. Administration of psilocybin typically produces perceptual distortions and mind-altering effects, which are mediated through 5-HT2A brain receptor agonistic action.⁴ The acute effects last approximately 6 hours.⁵ While psilocybin has generated promising results in early clinical trials,³ the adverse effects of these agents have received less attention.

The adverse effect profile of psilocybin in adults appears promising but its powerful psychoactive effects necessitate cautious use.⁶ It has a very wide therapeutic index, and in a recent meta-analysis of psilocybin for depression, no serious adverse effects were reported in any of the 7 included studies.⁷ Common adverse effects in the context of clinical use include anxiety, dysphoria, confusion, and an increase in blood pressure and heart rate.⁶ Due to potential cardiac effects, psilocybin is contraindicated in individuals with cardiovascular and cerebrovascular disease.⁸ In recreational/nonclinical use, reactions such as suicidality, violence, convulsions, panic attacks, paranoia, confusion, prolonged dissociation, and mania have been reported.^9,10 Animal and human studies indicate the risk of abuse and physical dependence is low. Major national surveys indicate low rates of abuse, treatment-seeking, and harm.¹¹ In a recent 6-week randomized controlled trial (RCT) of psilocybin vs escitalopram for depression,¹² no serious adverse events were reported. Adverse events reported in the psilocybin group in this trial are listed in Table 2.¹²

A recent phase 2 double-blind trial of single-dose psilocybin (1 mg, 10 mg, and 25 mg) for treatment-resistant depression (N = 233) sheds more light on the risk of adverse effects.¹³ The percentage of individuals experiencing adverse effects on Day 1 of administration was high: 61% in the 25 mg psilocybin group. Headache, nausea, fatigue, and dizziness were the most common effects. The incidence of any adverse event in the 25 mg group was 56% from Day 2 to Week 3, and 29% from Week 3 to Week 12. Suicidal ideation, suicidal behavior, or self-injury occurred in all 3 dose groups. Overall, 14% in the 25 mg group, 17% in the 10 mg group, and 9% in the 1 mg group showed worsening of suicidality from baseline to Week 3. Suicidal behavior was reported by 3 individuals in the 25 mg group after Week 3. The new-onset or worsening of preexisting suicidality with psilocybin reported in this study requires further investigation.

Lysergic acid diethylamide

LSD is similar to psilocybin in its agonistic action at the 5-HT2A brain receptors.⁴ It is typically administered as a single 100 to 200 μg dose and is used in conjunction with preintegration and postintegration psychotherapy.¹⁴ Its acute effects last approximately 12 hours.¹⁵

Continue to: Like psilocybin...

Like psilocybin, LSD has a wide therapeutic index. Commonly reported adverse effects of LSD are increased anxiety, dysphoria, and confusion. LSD can also lead to physiological adverse effects, such as increased blood pressure and heart rate, and thus is contraindicated in patients with severe heart disease.⁶ In a systematic review of the therapeutic use of LSD that included 567 participants,¹⁶ 2 cases of serious adverse events were reported: a tonic-clonic seizure in a patient with a prior history of seizures, and a case of prolonged psychosis in a 21-year-old with a history of psychotic disorder.

Though few psychedelic studies have examined the adverse effects of these agents in older adults, a recent phase 1 study that recruited 48 healthy older adults (age 55 to 75) found that, compared to placebo, low doses (5 to 20 μg) of LSD 2 times a week for 3 weeks had similar adverse effects, cognitive impairment, or balance impairment.¹⁷ The only adverse effect noted to be different between the placebo group and active treatment groups was headache (50% for LSD 10 μg, 25% for LSD 20 μg, and 8% for placebo). Because the dose range (5 to 20 μg) used in this study was substantially lower than the typical therapeutic dose range of 100 to 200 μg, these results should not be interpreted as supporting the safety of LSD at higher doses in older adults.

DMT/ayahuasca

Ayahuasca is a plant-based psychedelic that contains an admixture of substances, including DMT, which acts as a 5-HT2A receptor agonist. In addition to DMT, ayahuasca also contains the alkaloid harmaline, which acts as a monoamine inhibitor. Use of ayahuasca can therefore pose a particular risk for individuals taking other serotonergic or noradrenergic medications or substances. The acute effects of DMT last approximately 4 hours,¹⁸ and acute administration of ayahuasca leads to a transient modified state of consciousness that is characterized by introspection, visions, enhanced emotions, and recall of personal memories.¹⁹ Research shows ayahuasca has been dosed at approximately 0.36 mg/kg of DMT for 1 dosing session alongside 6 2-hour therapy sessions.²⁰

A recent review by Orsolini et al²¹ consolidated 40 preclinical, observational, and experimental studies of ayahuasca, and this compound appeared to be safe and well-tolerated; the most common adverse effects were transient emesis and nausea. In an RCT by Palhano-Fontes et al,²⁰ nausea was observed in 71% of participants in the ayahuasca group (vs 26% placebo), vomiting in 57% of participants (vs 0% placebo), and restlessness in 50% of participants (vs 20% placebo). The authors noted that for some participants the ayahuasca session “was not necessarily a pleasant experience,” and was accompanied by psychological distress.²⁰ Vomiting is traditionally viewed as an expected part of the purging process of ayahuasca religious ceremonies. Another review found that there appears to be good long-term tolerability of ayahuasca consumption among individuals who use this compound in religious ceremonies.²²

MDMA

Entactogens (or empathogens) are a class of psychoactive substances that produce experiences of emotional openness and connection. MDMA is an entactogen known to release serotonin, norepinephrine, and dopamine by inhibiting reuptake.²³ This process leads to the stimulation of neurohormonal signaling of oxytocin, cortisol, and other signaling molecules such as brain-derived neurotrophic factor.²⁴ Memory reconsolidation and fear extinction may also play a therapeutic role, enabled by reduced activity in the amygdala and insula, and increased connectivity between the amygdala and hippocampus.²⁴ MDMA has been reported to enhance feelings of well-being and increase prosocial behavior.²⁵ In the therapeutic setting, MDMA has been generally dosed at 75 to 125 mg in 2 to 3 sessions alongside 10 therapy sessions. Administration of MDMA gives the user a subjective experience of energy and distortions in time and perception.²⁶ These acute effects last approximately 2 to 4 hours.²⁷

Continue to: A meta-analysis...

A meta-analysis of 5 RCTs of MDMA-assisted therapy for PTSD in adults demonstrated that MDMA was well-tolerated, and few serious adverse events were reported.²⁸ Two trials from 2018 that were included in this meta-analysis—Mithoefer et al²⁹ and Ot’alora et al³⁰—illustrate the incidence of specific adverse effects. In a randomized, double-blind trial of 26 veterans and first responders with chronic PTSD, Mithoefer et al²⁹ found the most commonly reported reactions during experimental sessions with MDMA were anxiety (81%), headache (69%), fatigue (62%), muscle tension (62%), and jaw clenching or tight jaw (50%). The most commonly reported reactions during 7 days of contact were fatigue (88%), anxiety (73%), insomnia (69%), headache (46%), muscle tension (46%), and increased irritability (46%). One instance of suicidal ideation was severe enough to require psychiatric hospitalization (this was the only instance of suicidal ideation among the 106 patients in the meta-analysis by Bahji et al²⁸); the patient subsequently completed the trial. Transient elevation in pulse, blood pressure, and body temperature were noted during sessions that did not require medical intervention.²⁹ Ot’alora et al³⁰ found similar common adverse reactions: anxiety, dizziness, fatigue, headache, jaw clenching, muscle tension, and irritability. There were no serious adverse effects.

While the use of MDMA in controlled interventional settings has resulted in relatively few adverse events, robust literature describes the risks associated with the nonclinical/recreational use of MDMA. In cases of MDMA toxicity, death has been reported.³¹ Acutely, MDMA may lead to sympathomimetic effects, including serotonin syndrome.³¹ Longer-term studies of MDMA users have found chronic recreational use to be associated with worse sleep, poor mood, anxiety disturbances, memory deficits, and attention problems.³² MDMA has also been found to have moderate potential for abuse.³³

Ketamine/esketamine

Ketamine is a dissociative anesthetic with some hallucinogenic effects. It is an N-methyl-d-aspartate (NMDA) antagonist frequently used in anesthesia, and it can induce a state of sedation, immobility, pain relief, and amnesia. In low doses, ketamine is used off-label to treat major depressive disorder and treatment-resistant depression. Most clinical trials of ketamine for depression have dosed IV ketamine from 0.5 to 1 mg/kg 1 to 3 times a week. It can also be administered as an IM, intranasal, oral, subcutaneous, or sublingual formulation.³⁴

Esketamine, the S(+)-enantiomer of ketamine, is also an NDMA antagonist. It has been developed as an intranasal formulation, typically dosed between 56 and 84 mg 2 times a week for 1 month, once a week for the following month, and once every 1 to 2 weeks thereafter.³⁵ In most ketamine and esketamine trials, these compounds have been used without psychotherapy, although some interventions have integrated psychotherapy with ketamine treatment.³⁶

Bennett et al³⁷ elaborated on 3 paradigms for ketamine treatment: biochemical, psychotherapeutic, and psychedelic. The biochemical model examines the neuro­biological effects of the medication. The psychotherapeutic model views ketamine as a way of assisting the psychotherapy process. The psychedelic model utilizes ketamine’s dissociative and psychedelic properties to induce an altered state of consciousness for therapeutic purposes and psychospiritual exploration.

Continue to: A systematic review...

A systematic review of the common adverse effects associated with ketamine use in clinical trials for depression reported dissociation, sedation, perceptual disturbances, anxiety, agitation, euphoria, hypertension, tachycardia, headache, and dizziness.³⁸ Adverse effects experienced with esketamine in clinical trials include dissociation, dizziness, sedation, hypertension, hypoesthesia, gastrointestinal symptoms, and euphoric mood (Table 3³⁹). A recent systemic review found both ketamine and esketamine demonstrated higher adverse events than control conditions. IV ketamine also demonstrated lower dropouts and adverse events when compared to intranasal esketamine.⁴⁰

Nonclinical/recreational use of ketamine is notable for urinary toxicity; 20% to 30% of frequent users of ketamine experience urinary problems that can range from ketamine-induced cystitis to hydronephrosis and kidney failure.⁴¹ Liver toxicity has also been reported with chronic use of high-dose ketamine. Ketamine is liable to abuse, dependence, and tolerance. There is evidence that nonclinical use of ketamine may lead to morbidity; impairment of memory, cognition, and attention; and urinary, gastric, and hepatic pathology.⁴²

The FDA prescribing information for esketamine lists aneurysmal vascular disease, arteriovenous malformation, and intracerebral hemorrhage as contraindications.³⁹ Patients with cardiovascular and cerebrovascular conditions and risk factors may be at increased risk of adverse effects due to an increase in blood pressure. Esketamine can impair attention, judgment, thinking, reaction speed, and motor skills. Other adverse effects of esketamine noted in the prescribing information include dissociation, dizziness, nausea, sedation, vertigo, hypoesthesia, anxiety, lethargy, vomiting, feeling drunk, and euphoric mood.³⁹A study of postmarketing safety concerns with esketamine using reports submitted to the FDA Adverse Event Reporting System (FAERS) revealed signals for suicidal ideation (reporting odds ratio [ROR] 24.03; 95% CI, 18.72 to 30.84), and completed suicide (ROR 5.75; 95% CI, 3.18 to 10.41).⁴³ The signals for suicidal and self-injurious ideation remained significant when compared to venlafaxine in the FAERS database, while suicide attempts and fatal suicide attempts were no longer significant.⁴³ Concerns regarding acute ketamine withdrawal have also been described in case reports.⁴⁴

Other safety considerations of psychedelics

Hallucinogen persisting perception disorder

Hallucinogen persisting perception disorder (HPPD) is a rare condition associated with hallucinogen use. It is characterized by the recurrence of perceptual disturbances that an individual experienced while using hallucinogenic substances that creates significant distress or impairment.⁴⁵ Because HPPD is a rare disorder, the exact prevalence is not well characterized, but DSM-5 suggests it is approximately 4.2%.⁴⁶ HPPD is associated with numerous psychoactive substances, including psilocybin, ayahuasca, MDMA, and ketamine, but is most associated with LSD.⁴⁵ HPPD is more likely to arise in individuals with histories of psychiatric illness or substance use disorders.⁴⁷

Serotonin toxicity and other serotonergic interactions

Serotonin toxicity is a risk of serotonergic psychedelics, particularly when such agents are used in combination with serotonergic psychotropic medications. The most severe manifestation of serotonin toxicity is serotonin syndrome, which manifests as a life-threatening condition characterized by myoclonus, rigidity, agitation, delirium, and unstable cardiovascular functioning. Many psychedelic compounds have transient serotonin-related adverse effects, but serotonin toxicity due to psychedelic use is rare.⁴⁸ Due to their mechanism of action, classical psychedelics are relatively safe in combination with monoamine oxidase inhibitors (MAOIs) and selective serotonin reuptake inhibitors. MDMA is a serotonin-releasing agent that has a higher risk of serotonin syndrome or hypertensive crisis when used in combination with MAOIs.⁴⁸

Boundary violations in psychedelic-assisted psychotherapy

A key task facing psychedelic research is to establish parameters for the safe and ethical use of these agents. This is particularly relevant given the hype that surrounds the psychedelic resurgence and what we know about the controversial history of these substances. Anderson et al⁴⁹ argued that “psychedelics can have lingering effects that include increased suggestibility and affective instability, as well as altered ego structure, social behaviour, and philosophical worldview. Stated simply, psychedelics can induce a vulnerable state both during and after treatment sessions.”

Continue to: Psychedelic treatment...

Psychedelic treatments such as psilocybin and MDMA are typically offered within the context of psychedelic-assisted psychotherapy, and some researchers have raised concerns regarding boundary violations,⁵⁰ given the patients’ particularly vulnerable states. In addition to concerns about sexual harassment, the financial exploitation of older adults is also a possible risk.⁵¹

Caveats to consider

Novel psychedelics therapies have demonstrated promising preliminary results for a broad range of psychiatric indications, including depression, end-of-life distress, substance use disorders, PTSD, and improving well-being. To date, psychedelics are generally well-tolerated in adults in clinical trials.

However, when it comes to adverse effects, there are challenges in regards to interpreting the psychedelic state.⁵² Some consider any unpleasant or unsettling psychedelic experience as an adverse reaction, while others consider it part of the therapeutic process. This is exemplified by the case of vomiting during ayahuasca ceremonies, which is generally considered part of the ritual. In such instances, it is essential to obtain informed consent and ensure participants are aware of these aspects of the experience. Compared to substances such as alcohol, opioids, and cocaine, psychedelics are remarkably safe from a physiological perspective, especially with regards to the risks of toxicity, mortality, and dependence.⁵³ Their psychological safety is less established, and more caution and research is needed. The high incidence of adverse effects and suicidality noted in the recent phase 2 trial of psilocybin in treatment resistant depression are a reminder of this.¹³

There is uncertainty regarding the magnitude of risk in real-world clinical practice, particularly regarding addiction, suicidality, and precipitation or worsening of psychotic disorders. For example, note the extensive exclusion criteria used in the psilocybin vs escitalopram RCT by Carhart-Harris et al¹²: currently or previously diagnosed psychotic disorder, immediate family member with a diagnosed psychotic disorder, significant medical comorbidity (eg, diabetes, epilepsy, severe cardiovascular disease, hepatic or renal failure), history of suicide attempts requiring hospitalization, history of mania, pregnancy, and abnormal QT interval prolongation, among others. It would be prudent to keep these contraindications in mind regarding the clinical use of psychedelics in the future. This is particularly important in older adults because such patients often have substantial medical comorbidities and are at greater risk for adverse effects. For ketamine, research has implicated the role of mu opioid agonism in mediating ketamine’s antidepressant effects.⁵⁴ This raises concerns about abuse, dependence, and addiction, especially with long-term use. There are also concerns regarding protracted withdrawal symptoms and associated suicidality.⁵⁵

The therapeutic use of psychedelics is an exciting and promising avenue, with ongoing research and a rapidly evolving literature. An attitude of cautious optimism is warranted, but efficacy and safety should be demonstrated in well-designed and rigorous trials with adequate long-term follow-up before routine clinical use is recommended.

Bottom Line

In clinical trials for psychiatric disorders, psychedelics have been associated with a range of cognitive, psychiatric, and psychoactive adverse effects but generally have been well-tolerated, with a low incidence of serious adverse effects.

Related Resources

• American Psychiatric Association. Position Statement on the Use of Psychedelic and Empathogenic Agents for Mental Health Conditions. Updated July 2022. Accessed October 24, 2022. https://www.psychiatry.org/getattachment/d5c13619-ca1f-491f-a7a8-b7141c800904/Position-Use-of-Psychedelic-Empathogenic-Agents.pdf
• Johns Hopkins Center for Psychedelic & Consciousness Research. https://hopkinspsychedelic.org/
• Multidisciplinary Association for Psychedelic Studies (MAPS). https://maps.org/

Drug Brand Names

Esketamine • Spravato
Ketamine • Ketalar
Venlafaxine • Effexor

Psychedelics are a class of substances known to produce alterations in consciousness and perception. In the last 2 decades, psychedelic research has garnered increasing attention from scientists, therapists, entrepreneurs, and the public. While many of these compounds remain illegal in the United States and in many parts of the world (Box¹), a recent resurrection of psychedelic research has motivated the FDA to designate multiple psychedelic compounds as “breakthrough therapies,” thereby expediting the investigation, development, and review of psychedelic treatments.

Box

There is growing evidence that psychedelics may be efficacious for treating a range of psychiatric disorders. Potential clinical indications for psychedelics include some forms of depression, posttraumatic stress disorder (PTSD), and substance use disorders (Table 1^2,3). In most instances, the clinical use of psychedelics is being investigated and offered in the context of psychedelic-assisted psychotherapy, though ketamine is a prominent exception. Ketamine and esketamine are already being used to treat depression, and FDA approval is anticipated for other psychedelics. An examination of the safety considerations of psychedelics for the treatment of psychiatric disorders is therefore highly relevant and timely.

This article examines the adverse effect profile of classical (psilocybin [“mushrooms”], lysergic acid diethylamide [LSD], and N,N-dimethyltryptamine [DMT]/ayahuasca) and nonclassical (the entactogen 3,4-methylenedioxymethamphetamine [MDMA, known as “ecstasy”] and the dissociative anesthetic ketamine) psychedelics.

Psilocybin

Psilocybin is typically administered as a single dose of 10 to 30 mg and used in conjunction with preintegration and postintegration psychotherapy. Administration of psilocybin typically produces perceptual distortions and mind-altering effects, which are mediated through 5-HT2A brain receptor agonistic action.⁴ The acute effects last approximately 6 hours.⁵ While psilocybin has generated promising results in early clinical trials,³ the adverse effects of these agents have received less attention.

The adverse effect profile of psilocybin in adults appears promising but its powerful psychoactive effects necessitate cautious use.⁶ It has a very wide therapeutic index, and in a recent meta-analysis of psilocybin for depression, no serious adverse effects were reported in any of the 7 included studies.⁷ Common adverse effects in the context of clinical use include anxiety, dysphoria, confusion, and an increase in blood pressure and heart rate.⁶ Due to potential cardiac effects, psilocybin is contraindicated in individuals with cardiovascular and cerebrovascular disease.⁸ In recreational/nonclinical use, reactions such as suicidality, violence, convulsions, panic attacks, paranoia, confusion, prolonged dissociation, and mania have been reported.^9,10 Animal and human studies indicate the risk of abuse and physical dependence is low. Major national surveys indicate low rates of abuse, treatment-seeking, and harm.¹¹ In a recent 6-week randomized controlled trial (RCT) of psilocybin vs escitalopram for depression,¹² no serious adverse events were reported. Adverse events reported in the psilocybin group in this trial are listed in Table 2.¹²

A recent phase 2 double-blind trial of single-dose psilocybin (1 mg, 10 mg, and 25 mg) for treatment-resistant depression (N = 233) sheds more light on the risk of adverse effects.¹³ The percentage of individuals experiencing adverse effects on Day 1 of administration was high: 61% in the 25 mg psilocybin group. Headache, nausea, fatigue, and dizziness were the most common effects. The incidence of any adverse event in the 25 mg group was 56% from Day 2 to Week 3, and 29% from Week 3 to Week 12. Suicidal ideation, suicidal behavior, or self-injury occurred in all 3 dose groups. Overall, 14% in the 25 mg group, 17% in the 10 mg group, and 9% in the 1 mg group showed worsening of suicidality from baseline to Week 3. Suicidal behavior was reported by 3 individuals in the 25 mg group after Week 3. The new-onset or worsening of preexisting suicidality with psilocybin reported in this study requires further investigation.

Lysergic acid diethylamide

LSD is similar to psilocybin in its agonistic action at the 5-HT2A brain receptors.⁴ It is typically administered as a single 100 to 200 μg dose and is used in conjunction with preintegration and postintegration psychotherapy.¹⁴ Its acute effects last approximately 12 hours.¹⁵

Continue to: Like psilocybin...

Like psilocybin, LSD has a wide therapeutic index. Commonly reported adverse effects of LSD are increased anxiety, dysphoria, and confusion. LSD can also lead to physiological adverse effects, such as increased blood pressure and heart rate, and thus is contraindicated in patients with severe heart disease.⁶ In a systematic review of the therapeutic use of LSD that included 567 participants,¹⁶ 2 cases of serious adverse events were reported: a tonic-clonic seizure in a patient with a prior history of seizures, and a case of prolonged psychosis in a 21-year-old with a history of psychotic disorder.

Though few psychedelic studies have examined the adverse effects of these agents in older adults, a recent phase 1 study that recruited 48 healthy older adults (age 55 to 75) found that, compared to placebo, low doses (5 to 20 μg) of LSD 2 times a week for 3 weeks had similar adverse effects, cognitive impairment, or balance impairment.¹⁷ The only adverse effect noted to be different between the placebo group and active treatment groups was headache (50% for LSD 10 μg, 25% for LSD 20 μg, and 8% for placebo). Because the dose range (5 to 20 μg) used in this study was substantially lower than the typical therapeutic dose range of 100 to 200 μg, these results should not be interpreted as supporting the safety of LSD at higher doses in older adults.

DMT/ayahuasca

Ayahuasca is a plant-based psychedelic that contains an admixture of substances, including DMT, which acts as a 5-HT2A receptor agonist. In addition to DMT, ayahuasca also contains the alkaloid harmaline, which acts as a monoamine inhibitor. Use of ayahuasca can therefore pose a particular risk for individuals taking other serotonergic or noradrenergic medications or substances. The acute effects of DMT last approximately 4 hours,¹⁸ and acute administration of ayahuasca leads to a transient modified state of consciousness that is characterized by introspection, visions, enhanced emotions, and recall of personal memories.¹⁹ Research shows ayahuasca has been dosed at approximately 0.36 mg/kg of DMT for 1 dosing session alongside 6 2-hour therapy sessions.²⁰

A recent review by Orsolini et al²¹ consolidated 40 preclinical, observational, and experimental studies of ayahuasca, and this compound appeared to be safe and well-tolerated; the most common adverse effects were transient emesis and nausea. In an RCT by Palhano-Fontes et al,²⁰ nausea was observed in 71% of participants in the ayahuasca group (vs 26% placebo), vomiting in 57% of participants (vs 0% placebo), and restlessness in 50% of participants (vs 20% placebo). The authors noted that for some participants the ayahuasca session “was not necessarily a pleasant experience,” and was accompanied by psychological distress.²⁰ Vomiting is traditionally viewed as an expected part of the purging process of ayahuasca religious ceremonies. Another review found that there appears to be good long-term tolerability of ayahuasca consumption among individuals who use this compound in religious ceremonies.²²

MDMA

Entactogens (or empathogens) are a class of psychoactive substances that produce experiences of emotional openness and connection. MDMA is an entactogen known to release serotonin, norepinephrine, and dopamine by inhibiting reuptake.²³ This process leads to the stimulation of neurohormonal signaling of oxytocin, cortisol, and other signaling molecules such as brain-derived neurotrophic factor.²⁴ Memory reconsolidation and fear extinction may also play a therapeutic role, enabled by reduced activity in the amygdala and insula, and increased connectivity between the amygdala and hippocampus.²⁴ MDMA has been reported to enhance feelings of well-being and increase prosocial behavior.²⁵ In the therapeutic setting, MDMA has been generally dosed at 75 to 125 mg in 2 to 3 sessions alongside 10 therapy sessions. Administration of MDMA gives the user a subjective experience of energy and distortions in time and perception.²⁶ These acute effects last approximately 2 to 4 hours.²⁷

Continue to: A meta-analysis...

A meta-analysis of 5 RCTs of MDMA-assisted therapy for PTSD in adults demonstrated that MDMA was well-tolerated, and few serious adverse events were reported.²⁸ Two trials from 2018 that were included in this meta-analysis—Mithoefer et al²⁹ and Ot’alora et al³⁰—illustrate the incidence of specific adverse effects. In a randomized, double-blind trial of 26 veterans and first responders with chronic PTSD, Mithoefer et al²⁹ found the most commonly reported reactions during experimental sessions with MDMA were anxiety (81%), headache (69%), fatigue (62%), muscle tension (62%), and jaw clenching or tight jaw (50%). The most commonly reported reactions during 7 days of contact were fatigue (88%), anxiety (73%), insomnia (69%), headache (46%), muscle tension (46%), and increased irritability (46%). One instance of suicidal ideation was severe enough to require psychiatric hospitalization (this was the only instance of suicidal ideation among the 106 patients in the meta-analysis by Bahji et al²⁸); the patient subsequently completed the trial. Transient elevation in pulse, blood pressure, and body temperature were noted during sessions that did not require medical intervention.²⁹ Ot’alora et al³⁰ found similar common adverse reactions: anxiety, dizziness, fatigue, headache, jaw clenching, muscle tension, and irritability. There were no serious adverse effects.

While the use of MDMA in controlled interventional settings has resulted in relatively few adverse events, robust literature describes the risks associated with the nonclinical/recreational use of MDMA. In cases of MDMA toxicity, death has been reported.³¹ Acutely, MDMA may lead to sympathomimetic effects, including serotonin syndrome.³¹ Longer-term studies of MDMA users have found chronic recreational use to be associated with worse sleep, poor mood, anxiety disturbances, memory deficits, and attention problems.³² MDMA has also been found to have moderate potential for abuse.³³

Ketamine/esketamine

Ketamine is a dissociative anesthetic with some hallucinogenic effects. It is an N-methyl-d-aspartate (NMDA) antagonist frequently used in anesthesia, and it can induce a state of sedation, immobility, pain relief, and amnesia. In low doses, ketamine is used off-label to treat major depressive disorder and treatment-resistant depression. Most clinical trials of ketamine for depression have dosed IV ketamine from 0.5 to 1 mg/kg 1 to 3 times a week. It can also be administered as an IM, intranasal, oral, subcutaneous, or sublingual formulation.³⁴

Esketamine, the S(+)-enantiomer of ketamine, is also an NDMA antagonist. It has been developed as an intranasal formulation, typically dosed between 56 and 84 mg 2 times a week for 1 month, once a week for the following month, and once every 1 to 2 weeks thereafter.³⁵ In most ketamine and esketamine trials, these compounds have been used without psychotherapy, although some interventions have integrated psychotherapy with ketamine treatment.³⁶

Bennett et al³⁷ elaborated on 3 paradigms for ketamine treatment: biochemical, psychotherapeutic, and psychedelic. The biochemical model examines the neuro­biological effects of the medication. The psychotherapeutic model views ketamine as a way of assisting the psychotherapy process. The psychedelic model utilizes ketamine’s dissociative and psychedelic properties to induce an altered state of consciousness for therapeutic purposes and psychospiritual exploration.

Continue to: A systematic review...

A systematic review of the common adverse effects associated with ketamine use in clinical trials for depression reported dissociation, sedation, perceptual disturbances, anxiety, agitation, euphoria, hypertension, tachycardia, headache, and dizziness.³⁸ Adverse effects experienced with esketamine in clinical trials include dissociation, dizziness, sedation, hypertension, hypoesthesia, gastrointestinal symptoms, and euphoric mood (Table 3³⁹). A recent systemic review found both ketamine and esketamine demonstrated higher adverse events than control conditions. IV ketamine also demonstrated lower dropouts and adverse events when compared to intranasal esketamine.⁴⁰

Nonclinical/recreational use of ketamine is notable for urinary toxicity; 20% to 30% of frequent users of ketamine experience urinary problems that can range from ketamine-induced cystitis to hydronephrosis and kidney failure.⁴¹ Liver toxicity has also been reported with chronic use of high-dose ketamine. Ketamine is liable to abuse, dependence, and tolerance. There is evidence that nonclinical use of ketamine may lead to morbidity; impairment of memory, cognition, and attention; and urinary, gastric, and hepatic pathology.⁴²

The FDA prescribing information for esketamine lists aneurysmal vascular disease, arteriovenous malformation, and intracerebral hemorrhage as contraindications.³⁹ Patients with cardiovascular and cerebrovascular conditions and risk factors may be at increased risk of adverse effects due to an increase in blood pressure. Esketamine can impair attention, judgment, thinking, reaction speed, and motor skills. Other adverse effects of esketamine noted in the prescribing information include dissociation, dizziness, nausea, sedation, vertigo, hypoesthesia, anxiety, lethargy, vomiting, feeling drunk, and euphoric mood.³⁹A study of postmarketing safety concerns with esketamine using reports submitted to the FDA Adverse Event Reporting System (FAERS) revealed signals for suicidal ideation (reporting odds ratio [ROR] 24.03; 95% CI, 18.72 to 30.84), and completed suicide (ROR 5.75; 95% CI, 3.18 to 10.41).⁴³ The signals for suicidal and self-injurious ideation remained significant when compared to venlafaxine in the FAERS database, while suicide attempts and fatal suicide attempts were no longer significant.⁴³ Concerns regarding acute ketamine withdrawal have also been described in case reports.⁴⁴

Other safety considerations of psychedelics

Hallucinogen persisting perception disorder

Hallucinogen persisting perception disorder (HPPD) is a rare condition associated with hallucinogen use. It is characterized by the recurrence of perceptual disturbances that an individual experienced while using hallucinogenic substances that creates significant distress or impairment.⁴⁵ Because HPPD is a rare disorder, the exact prevalence is not well characterized, but DSM-5 suggests it is approximately 4.2%.⁴⁶ HPPD is associated with numerous psychoactive substances, including psilocybin, ayahuasca, MDMA, and ketamine, but is most associated with LSD.⁴⁵ HPPD is more likely to arise in individuals with histories of psychiatric illness or substance use disorders.⁴⁷

Serotonin toxicity and other serotonergic interactions

Serotonin toxicity is a risk of serotonergic psychedelics, particularly when such agents are used in combination with serotonergic psychotropic medications. The most severe manifestation of serotonin toxicity is serotonin syndrome, which manifests as a life-threatening condition characterized by myoclonus, rigidity, agitation, delirium, and unstable cardiovascular functioning. Many psychedelic compounds have transient serotonin-related adverse effects, but serotonin toxicity due to psychedelic use is rare.⁴⁸ Due to their mechanism of action, classical psychedelics are relatively safe in combination with monoamine oxidase inhibitors (MAOIs) and selective serotonin reuptake inhibitors. MDMA is a serotonin-releasing agent that has a higher risk of serotonin syndrome or hypertensive crisis when used in combination with MAOIs.⁴⁸

Boundary violations in psychedelic-assisted psychotherapy

A key task facing psychedelic research is to establish parameters for the safe and ethical use of these agents. This is particularly relevant given the hype that surrounds the psychedelic resurgence and what we know about the controversial history of these substances. Anderson et al⁴⁹ argued that “psychedelics can have lingering effects that include increased suggestibility and affective instability, as well as altered ego structure, social behaviour, and philosophical worldview. Stated simply, psychedelics can induce a vulnerable state both during and after treatment sessions.”

Continue to: Psychedelic treatment...

Psychedelic treatments such as psilocybin and MDMA are typically offered within the context of psychedelic-assisted psychotherapy, and some researchers have raised concerns regarding boundary violations,⁵⁰ given the patients’ particularly vulnerable states. In addition to concerns about sexual harassment, the financial exploitation of older adults is also a possible risk.⁵¹

Caveats to consider

Novel psychedelics therapies have demonstrated promising preliminary results for a broad range of psychiatric indications, including depression, end-of-life distress, substance use disorders, PTSD, and improving well-being. To date, psychedelics are generally well-tolerated in adults in clinical trials.

However, when it comes to adverse effects, there are challenges in regards to interpreting the psychedelic state.⁵² Some consider any unpleasant or unsettling psychedelic experience as an adverse reaction, while others consider it part of the therapeutic process. This is exemplified by the case of vomiting during ayahuasca ceremonies, which is generally considered part of the ritual. In such instances, it is essential to obtain informed consent and ensure participants are aware of these aspects of the experience. Compared to substances such as alcohol, opioids, and cocaine, psychedelics are remarkably safe from a physiological perspective, especially with regards to the risks of toxicity, mortality, and dependence.⁵³ Their psychological safety is less established, and more caution and research is needed. The high incidence of adverse effects and suicidality noted in the recent phase 2 trial of psilocybin in treatment resistant depression are a reminder of this.¹³

There is uncertainty regarding the magnitude of risk in real-world clinical practice, particularly regarding addiction, suicidality, and precipitation or worsening of psychotic disorders. For example, note the extensive exclusion criteria used in the psilocybin vs escitalopram RCT by Carhart-Harris et al¹²: currently or previously diagnosed psychotic disorder, immediate family member with a diagnosed psychotic disorder, significant medical comorbidity (eg, diabetes, epilepsy, severe cardiovascular disease, hepatic or renal failure), history of suicide attempts requiring hospitalization, history of mania, pregnancy, and abnormal QT interval prolongation, among others. It would be prudent to keep these contraindications in mind regarding the clinical use of psychedelics in the future. This is particularly important in older adults because such patients often have substantial medical comorbidities and are at greater risk for adverse effects. For ketamine, research has implicated the role of mu opioid agonism in mediating ketamine’s antidepressant effects.⁵⁴ This raises concerns about abuse, dependence, and addiction, especially with long-term use. There are also concerns regarding protracted withdrawal symptoms and associated suicidality.⁵⁵

The therapeutic use of psychedelics is an exciting and promising avenue, with ongoing research and a rapidly evolving literature. An attitude of cautious optimism is warranted, but efficacy and safety should be demonstrated in well-designed and rigorous trials with adequate long-term follow-up before routine clinical use is recommended.

Bottom Line

In clinical trials for psychiatric disorders, psychedelics have been associated with a range of cognitive, psychiatric, and psychoactive adverse effects but generally have been well-tolerated, with a low incidence of serious adverse effects.

Related Resources

• American Psychiatric Association. Position Statement on the Use of Psychedelic and Empathogenic Agents for Mental Health Conditions. Updated July 2022. Accessed October 24, 2022. https://www.psychiatry.org/getattachment/d5c13619-ca1f-491f-a7a8-b7141c800904/Position-Use-of-Psychedelic-Empathogenic-Agents.pdf
• Johns Hopkins Center for Psychedelic & Consciousness Research. https://hopkinspsychedelic.org/
• Multidisciplinary Association for Psychedelic Studies (MAPS). https://maps.org/

Drug Brand Names

Esketamine • Spravato
Ketamine • Ketalar
Venlafaxine • Effexor

Psychedelics are a class of substances known to produce alterations in consciousness and perception. In the last 2 decades, psychedelic research has garnered increasing attention from scientists, therapists, entrepreneurs, and the public. While many of these compounds remain illegal in the United States and in many parts of the world (Box¹), a recent resurrection of psychedelic research has motivated the FDA to designate multiple psychedelic compounds as “breakthrough therapies,” thereby expediting the investigation, development, and review of psychedelic treatments.

Box

There is growing evidence that psychedelics may be efficacious for treating a range of psychiatric disorders. Potential clinical indications for psychedelics include some forms of depression, posttraumatic stress disorder (PTSD), and substance use disorders (Table 1^2,3). In most instances, the clinical use of psychedelics is being investigated and offered in the context of psychedelic-assisted psychotherapy, though ketamine is a prominent exception. Ketamine and esketamine are already being used to treat depression, and FDA approval is anticipated for other psychedelics. An examination of the safety considerations of psychedelics for the treatment of psychiatric disorders is therefore highly relevant and timely.

This article examines the adverse effect profile of classical (psilocybin [“mushrooms”], lysergic acid diethylamide [LSD], and N,N-dimethyltryptamine [DMT]/ayahuasca) and nonclassical (the entactogen 3,4-methylenedioxymethamphetamine [MDMA, known as “ecstasy”] and the dissociative anesthetic ketamine) psychedelics.

Psilocybin

Psilocybin is typically administered as a single dose of 10 to 30 mg and used in conjunction with preintegration and postintegration psychotherapy. Administration of psilocybin typically produces perceptual distortions and mind-altering effects, which are mediated through 5-HT2A brain receptor agonistic action.⁴ The acute effects last approximately 6 hours.⁵ While psilocybin has generated promising results in early clinical trials,³ the adverse effects of these agents have received less attention.

The adverse effect profile of psilocybin in adults appears promising but its powerful psychoactive effects necessitate cautious use.⁶ It has a very wide therapeutic index, and in a recent meta-analysis of psilocybin for depression, no serious adverse effects were reported in any of the 7 included studies.⁷ Common adverse effects in the context of clinical use include anxiety, dysphoria, confusion, and an increase in blood pressure and heart rate.⁶ Due to potential cardiac effects, psilocybin is contraindicated in individuals with cardiovascular and cerebrovascular disease.⁸ In recreational/nonclinical use, reactions such as suicidality, violence, convulsions, panic attacks, paranoia, confusion, prolonged dissociation, and mania have been reported.^9,10 Animal and human studies indicate the risk of abuse and physical dependence is low. Major national surveys indicate low rates of abuse, treatment-seeking, and harm.¹¹ In a recent 6-week randomized controlled trial (RCT) of psilocybin vs escitalopram for depression,¹² no serious adverse events were reported. Adverse events reported in the psilocybin group in this trial are listed in Table 2.¹²

A recent phase 2 double-blind trial of single-dose psilocybin (1 mg, 10 mg, and 25 mg) for treatment-resistant depression (N = 233) sheds more light on the risk of adverse effects.¹³ The percentage of individuals experiencing adverse effects on Day 1 of administration was high: 61% in the 25 mg psilocybin group. Headache, nausea, fatigue, and dizziness were the most common effects. The incidence of any adverse event in the 25 mg group was 56% from Day 2 to Week 3, and 29% from Week 3 to Week 12. Suicidal ideation, suicidal behavior, or self-injury occurred in all 3 dose groups. Overall, 14% in the 25 mg group, 17% in the 10 mg group, and 9% in the 1 mg group showed worsening of suicidality from baseline to Week 3. Suicidal behavior was reported by 3 individuals in the 25 mg group after Week 3. The new-onset or worsening of preexisting suicidality with psilocybin reported in this study requires further investigation.

Lysergic acid diethylamide

LSD is similar to psilocybin in its agonistic action at the 5-HT2A brain receptors.⁴ It is typically administered as a single 100 to 200 μg dose and is used in conjunction with preintegration and postintegration psychotherapy.¹⁴ Its acute effects last approximately 12 hours.¹⁵

Continue to: Like psilocybin...

Like psilocybin, LSD has a wide therapeutic index. Commonly reported adverse effects of LSD are increased anxiety, dysphoria, and confusion. LSD can also lead to physiological adverse effects, such as increased blood pressure and heart rate, and thus is contraindicated in patients with severe heart disease.⁶ In a systematic review of the therapeutic use of LSD that included 567 participants,¹⁶ 2 cases of serious adverse events were reported: a tonic-clonic seizure in a patient with a prior history of seizures, and a case of prolonged psychosis in a 21-year-old with a history of psychotic disorder.

Though few psychedelic studies have examined the adverse effects of these agents in older adults, a recent phase 1 study that recruited 48 healthy older adults (age 55 to 75) found that, compared to placebo, low doses (5 to 20 μg) of LSD 2 times a week for 3 weeks had similar adverse effects, cognitive impairment, or balance impairment.¹⁷ The only adverse effect noted to be different between the placebo group and active treatment groups was headache (50% for LSD 10 μg, 25% for LSD 20 μg, and 8% for placebo). Because the dose range (5 to 20 μg) used in this study was substantially lower than the typical therapeutic dose range of 100 to 200 μg, these results should not be interpreted as supporting the safety of LSD at higher doses in older adults.

DMT/ayahuasca

Ayahuasca is a plant-based psychedelic that contains an admixture of substances, including DMT, which acts as a 5-HT2A receptor agonist. In addition to DMT, ayahuasca also contains the alkaloid harmaline, which acts as a monoamine inhibitor. Use of ayahuasca can therefore pose a particular risk for individuals taking other serotonergic or noradrenergic medications or substances. The acute effects of DMT last approximately 4 hours,¹⁸ and acute administration of ayahuasca leads to a transient modified state of consciousness that is characterized by introspection, visions, enhanced emotions, and recall of personal memories.¹⁹ Research shows ayahuasca has been dosed at approximately 0.36 mg/kg of DMT for 1 dosing session alongside 6 2-hour therapy sessions.²⁰

A recent review by Orsolini et al²¹ consolidated 40 preclinical, observational, and experimental studies of ayahuasca, and this compound appeared to be safe and well-tolerated; the most common adverse effects were transient emesis and nausea. In an RCT by Palhano-Fontes et al,²⁰ nausea was observed in 71% of participants in the ayahuasca group (vs 26% placebo), vomiting in 57% of participants (vs 0% placebo), and restlessness in 50% of participants (vs 20% placebo). The authors noted that for some participants the ayahuasca session “was not necessarily a pleasant experience,” and was accompanied by psychological distress.²⁰ Vomiting is traditionally viewed as an expected part of the purging process of ayahuasca religious ceremonies. Another review found that there appears to be good long-term tolerability of ayahuasca consumption among individuals who use this compound in religious ceremonies.²²

MDMA

Entactogens (or empathogens) are a class of psychoactive substances that produce experiences of emotional openness and connection. MDMA is an entactogen known to release serotonin, norepinephrine, and dopamine by inhibiting reuptake.²³ This process leads to the stimulation of neurohormonal signaling of oxytocin, cortisol, and other signaling molecules such as brain-derived neurotrophic factor.²⁴ Memory reconsolidation and fear extinction may also play a therapeutic role, enabled by reduced activity in the amygdala and insula, and increased connectivity between the amygdala and hippocampus.²⁴ MDMA has been reported to enhance feelings of well-being and increase prosocial behavior.²⁵ In the therapeutic setting, MDMA has been generally dosed at 75 to 125 mg in 2 to 3 sessions alongside 10 therapy sessions. Administration of MDMA gives the user a subjective experience of energy and distortions in time and perception.²⁶ These acute effects last approximately 2 to 4 hours.²⁷

Continue to: A meta-analysis...

A meta-analysis of 5 RCTs of MDMA-assisted therapy for PTSD in adults demonstrated that MDMA was well-tolerated, and few serious adverse events were reported.²⁸ Two trials from 2018 that were included in this meta-analysis—Mithoefer et al²⁹ and Ot’alora et al³⁰—illustrate the incidence of specific adverse effects. In a randomized, double-blind trial of 26 veterans and first responders with chronic PTSD, Mithoefer et al²⁹ found the most commonly reported reactions during experimental sessions with MDMA were anxiety (81%), headache (69%), fatigue (62%), muscle tension (62%), and jaw clenching or tight jaw (50%). The most commonly reported reactions during 7 days of contact were fatigue (88%), anxiety (73%), insomnia (69%), headache (46%), muscle tension (46%), and increased irritability (46%). One instance of suicidal ideation was severe enough to require psychiatric hospitalization (this was the only instance of suicidal ideation among the 106 patients in the meta-analysis by Bahji et al²⁸); the patient subsequently completed the trial. Transient elevation in pulse, blood pressure, and body temperature were noted during sessions that did not require medical intervention.²⁹ Ot’alora et al³⁰ found similar common adverse reactions: anxiety, dizziness, fatigue, headache, jaw clenching, muscle tension, and irritability. There were no serious adverse effects.

While the use of MDMA in controlled interventional settings has resulted in relatively few adverse events, robust literature describes the risks associated with the nonclinical/recreational use of MDMA. In cases of MDMA toxicity, death has been reported.³¹ Acutely, MDMA may lead to sympathomimetic effects, including serotonin syndrome.³¹ Longer-term studies of MDMA users have found chronic recreational use to be associated with worse sleep, poor mood, anxiety disturbances, memory deficits, and attention problems.³² MDMA has also been found to have moderate potential for abuse.³³

Ketamine/esketamine

Ketamine is a dissociative anesthetic with some hallucinogenic effects. It is an N-methyl-d-aspartate (NMDA) antagonist frequently used in anesthesia, and it can induce a state of sedation, immobility, pain relief, and amnesia. In low doses, ketamine is used off-label to treat major depressive disorder and treatment-resistant depression. Most clinical trials of ketamine for depression have dosed IV ketamine from 0.5 to 1 mg/kg 1 to 3 times a week. It can also be administered as an IM, intranasal, oral, subcutaneous, or sublingual formulation.³⁴

Esketamine, the S(+)-enantiomer of ketamine, is also an NDMA antagonist. It has been developed as an intranasal formulation, typically dosed between 56 and 84 mg 2 times a week for 1 month, once a week for the following month, and once every 1 to 2 weeks thereafter.³⁵ In most ketamine and esketamine trials, these compounds have been used without psychotherapy, although some interventions have integrated psychotherapy with ketamine treatment.³⁶

Bennett et al³⁷ elaborated on 3 paradigms for ketamine treatment: biochemical, psychotherapeutic, and psychedelic. The biochemical model examines the neuro­biological effects of the medication. The psychotherapeutic model views ketamine as a way of assisting the psychotherapy process. The psychedelic model utilizes ketamine’s dissociative and psychedelic properties to induce an altered state of consciousness for therapeutic purposes and psychospiritual exploration.

Continue to: A systematic review...

A systematic review of the common adverse effects associated with ketamine use in clinical trials for depression reported dissociation, sedation, perceptual disturbances, anxiety, agitation, euphoria, hypertension, tachycardia, headache, and dizziness.³⁸ Adverse effects experienced with esketamine in clinical trials include dissociation, dizziness, sedation, hypertension, hypoesthesia, gastrointestinal symptoms, and euphoric mood (Table 3³⁹). A recent systemic review found both ketamine and esketamine demonstrated higher adverse events than control conditions. IV ketamine also demonstrated lower dropouts and adverse events when compared to intranasal esketamine.⁴⁰

Nonclinical/recreational use of ketamine is notable for urinary toxicity; 20% to 30% of frequent users of ketamine experience urinary problems that can range from ketamine-induced cystitis to hydronephrosis and kidney failure.⁴¹ Liver toxicity has also been reported with chronic use of high-dose ketamine. Ketamine is liable to abuse, dependence, and tolerance. There is evidence that nonclinical use of ketamine may lead to morbidity; impairment of memory, cognition, and attention; and urinary, gastric, and hepatic pathology.⁴²

The FDA prescribing information for esketamine lists aneurysmal vascular disease, arteriovenous malformation, and intracerebral hemorrhage as contraindications.³⁹ Patients with cardiovascular and cerebrovascular conditions and risk factors may be at increased risk of adverse effects due to an increase in blood pressure. Esketamine can impair attention, judgment, thinking, reaction speed, and motor skills. Other adverse effects of esketamine noted in the prescribing information include dissociation, dizziness, nausea, sedation, vertigo, hypoesthesia, anxiety, lethargy, vomiting, feeling drunk, and euphoric mood.³⁹A study of postmarketing safety concerns with esketamine using reports submitted to the FDA Adverse Event Reporting System (FAERS) revealed signals for suicidal ideation (reporting odds ratio [ROR] 24.03; 95% CI, 18.72 to 30.84), and completed suicide (ROR 5.75; 95% CI, 3.18 to 10.41).⁴³ The signals for suicidal and self-injurious ideation remained significant when compared to venlafaxine in the FAERS database, while suicide attempts and fatal suicide attempts were no longer significant.⁴³ Concerns regarding acute ketamine withdrawal have also been described in case reports.⁴⁴

Other safety considerations of psychedelics

Hallucinogen persisting perception disorder

Hallucinogen persisting perception disorder (HPPD) is a rare condition associated with hallucinogen use. It is characterized by the recurrence of perceptual disturbances that an individual experienced while using hallucinogenic substances that creates significant distress or impairment.⁴⁵ Because HPPD is a rare disorder, the exact prevalence is not well characterized, but DSM-5 suggests it is approximately 4.2%.⁴⁶ HPPD is associated with numerous psychoactive substances, including psilocybin, ayahuasca, MDMA, and ketamine, but is most associated with LSD.⁴⁵ HPPD is more likely to arise in individuals with histories of psychiatric illness or substance use disorders.⁴⁷

Serotonin toxicity and other serotonergic interactions

Serotonin toxicity is a risk of serotonergic psychedelics, particularly when such agents are used in combination with serotonergic psychotropic medications. The most severe manifestation of serotonin toxicity is serotonin syndrome, which manifests as a life-threatening condition characterized by myoclonus, rigidity, agitation, delirium, and unstable cardiovascular functioning. Many psychedelic compounds have transient serotonin-related adverse effects, but serotonin toxicity due to psychedelic use is rare.⁴⁸ Due to their mechanism of action, classical psychedelics are relatively safe in combination with monoamine oxidase inhibitors (MAOIs) and selective serotonin reuptake inhibitors. MDMA is a serotonin-releasing agent that has a higher risk of serotonin syndrome or hypertensive crisis when used in combination with MAOIs.⁴⁸

Boundary violations in psychedelic-assisted psychotherapy

A key task facing psychedelic research is to establish parameters for the safe and ethical use of these agents. This is particularly relevant given the hype that surrounds the psychedelic resurgence and what we know about the controversial history of these substances. Anderson et al⁴⁹ argued that “psychedelics can have lingering effects that include increased suggestibility and affective instability, as well as altered ego structure, social behaviour, and philosophical worldview. Stated simply, psychedelics can induce a vulnerable state both during and after treatment sessions.”

Continue to: Psychedelic treatment...

Psychedelic treatments such as psilocybin and MDMA are typically offered within the context of psychedelic-assisted psychotherapy, and some researchers have raised concerns regarding boundary violations,⁵⁰ given the patients’ particularly vulnerable states. In addition to concerns about sexual harassment, the financial exploitation of older adults is also a possible risk.⁵¹

Caveats to consider

Novel psychedelics therapies have demonstrated promising preliminary results for a broad range of psychiatric indications, including depression, end-of-life distress, substance use disorders, PTSD, and improving well-being. To date, psychedelics are generally well-tolerated in adults in clinical trials.

However, when it comes to adverse effects, there are challenges in regards to interpreting the psychedelic state.⁵² Some consider any unpleasant or unsettling psychedelic experience as an adverse reaction, while others consider it part of the therapeutic process. This is exemplified by the case of vomiting during ayahuasca ceremonies, which is generally considered part of the ritual. In such instances, it is essential to obtain informed consent and ensure participants are aware of these aspects of the experience. Compared to substances such as alcohol, opioids, and cocaine, psychedelics are remarkably safe from a physiological perspective, especially with regards to the risks of toxicity, mortality, and dependence.⁵³ Their psychological safety is less established, and more caution and research is needed. The high incidence of adverse effects and suicidality noted in the recent phase 2 trial of psilocybin in treatment resistant depression are a reminder of this.¹³

There is uncertainty regarding the magnitude of risk in real-world clinical practice, particularly regarding addiction, suicidality, and precipitation or worsening of psychotic disorders. For example, note the extensive exclusion criteria used in the psilocybin vs escitalopram RCT by Carhart-Harris et al¹²: currently or previously diagnosed psychotic disorder, immediate family member with a diagnosed psychotic disorder, significant medical comorbidity (eg, diabetes, epilepsy, severe cardiovascular disease, hepatic or renal failure), history of suicide attempts requiring hospitalization, history of mania, pregnancy, and abnormal QT interval prolongation, among others. It would be prudent to keep these contraindications in mind regarding the clinical use of psychedelics in the future. This is particularly important in older adults because such patients often have substantial medical comorbidities and are at greater risk for adverse effects. For ketamine, research has implicated the role of mu opioid agonism in mediating ketamine’s antidepressant effects.⁵⁴ This raises concerns about abuse, dependence, and addiction, especially with long-term use. There are also concerns regarding protracted withdrawal symptoms and associated suicidality.⁵⁵

The therapeutic use of psychedelics is an exciting and promising avenue, with ongoing research and a rapidly evolving literature. An attitude of cautious optimism is warranted, but efficacy and safety should be demonstrated in well-designed and rigorous trials with adequate long-term follow-up before routine clinical use is recommended.

Bottom Line

In clinical trials for psychiatric disorders, psychedelics have been associated with a range of cognitive, psychiatric, and psychoactive adverse effects but generally have been well-tolerated, with a low incidence of serious adverse effects.

Related Resources

• American Psychiatric Association. Position Statement on the Use of Psychedelic and Empathogenic Agents for Mental Health Conditions. Updated July 2022. Accessed October 24, 2022. https://www.psychiatry.org/getattachment/d5c13619-ca1f-491f-a7a8-b7141c800904/Position-Use-of-Psychedelic-Empathogenic-Agents.pdf
• Johns Hopkins Center for Psychedelic & Consciousness Research. https://hopkinspsychedelic.org/
• Multidisciplinary Association for Psychedelic Studies (MAPS). https://maps.org/

Drug Brand Names

Esketamine • Spravato
Ketamine • Ketalar
Venlafaxine • Effexor

Resilience has been defined as the ability to adapt and thrive in the face of adversity, acute stress, or trauma.¹ Originally conceived as an inborn trait characteristic, resilience is now conceptualized as a dynamic, multidimensional capacity influenced by the interactions between internal factors (eg, personality, cognitive capacity, physical health) and environmental resources (eg, social status, financial stability).^2,3 Resilience in older adults (typically defined as age ≥65) can improve the prognosis and outcomes for physical and mental conditions.⁴ The construct is closely aligned with “successful aging” and can be fostered in older adults, leading to improved physical and mental health and well-being.⁵

While initially resilience was conceptualized as the opposite of depressive states, recent research has identified resilience in the context of major depressive disorder (MDD) as the net effects of various psychosocial and biological variables that decrease the risk of onset, relapse, or depressive illness severity and increase the probability or speed of recovery.⁶ Late-life depression (LLD) in adults age >65 is a common and debilitating disease, often leading to decreased psychological well-being, increased cognitive decline, and excess mortality.^7,8 LLD is associated with several factors, such as cerebrovascular disease, neurodegenerative disease, and inflammation, all of which could contribute to brain vulnerability and an increased risk of depression.⁹ Physical and cognitive engagement, physical activity, and high brain reserve have been shown to confer resilience to affective and cognitive changes in older adults, despite brain vulnerability.⁹

The greatest levels of resilience have been observed in individuals in their fifth decade of life and later,^4,10 with high levels of resilience significantly contributing to longevity⁵; however, little is known about which factors contribute to heterogeneity in resilience characteristics and outcomes.⁴ Furthermore, the concept of resilience continues to raise numerous questions, including:

• how resilience should be measured or defined
• what factors promote or deter the development of resilience
• the effects of resilience on various health and psychological outcomes
• which interventions are effective in enhancing resilience in older adults.⁴

In this article, we describe resilience in older adults with LLD, its clinical and neurocognitive correlates, and underlying neurobiological and immunological biomarkers. We also examine resilience-building interventions, such as mind-body therapies (MBTs), that have been shown to enhance resilience by promoting positive perceptions of difficult experiences and challenges.

Clinical and neurocognitive correlates of resilience

Resilience varies substantially among older adults with LLD as well as across the lifespan of an individual.¹¹ Identifying clinical components and predictors of resilience may usefully inform the development and testing of interventions to prevent and treat LLD.¹¹ One tool widely used to measure resilience—the self-report Connor-Davidson Resilience Scale (CD-RISC)¹²— has been found to have clinically relevant characteristics.^1,11 Using data from 337 older adults with LLD, Laird et al¹¹ performed an exploratory factor analysis of the CD-RISC and found a 4-factor model:

• grit
• adaptive coping self-efficacy
• accommodative coping self-efficacy
• spirituality.^1,11

Having a strong sense of purpose and not being easily discouraged by failure were items characteristic of grit.^1,11 The preference to take the lead in problem-solving was typical of items loading on adaptive coping self-efficacy, while accommodative coping self-efficacy measured flexibility, cognitive reframing, a sense of humor, and acceptance in the face of uncontrollable stress.^1,11 Finally, the belief that “things happen for a reason” and that “sometimes fate or God can help me” are characteristics of spirituality. ^1,11 Using a multivariate model, the greatest variance in total resilience scores was explained by less depression, less apathy, higher quality of life, non-White race, and, somewhat counterintuitively, greater medical comorbidity.^1,11 Thus, interventions designed to help older adults cultivate grit, active coping, accommodative coping, and spirituality may enhance resilience in LLD.^1,11

Resilience may also be positively associated with cognitive functioning and could be neuroprotective in LLD.¹³ Laird et al¹³ investigated associations between baseline resilience and several domains of neurocognitive functioning in 288 older adults with LLD. Several positive associations were found between measured language performance and total resilience, active coping, and accommodative coping.¹³ Additionally, total resilience and accommodative coping were significantly associated with a lower self-reported frequency of forgetfulness, a subjective measure of memory used in this study.¹³ Together, these results suggest that interventions targeting language might be useful to improve coping in LLD.¹³ Another interesting finding was that the resilience subdomain of spirituality was negatively associated with memory, language, and executive functioning performance.¹³ A distinction must be made between religious attendance (eg, regular attendance at religious institutions) vs religious beliefs, which may account for the previously reported associations between spirituality and improved cognition.¹³

Continue to: Self-reported resilience...

Self-reported resilience may also predict greater responsivity to antidepressant medication in patients with LLD.¹⁴ Older adults with LLD and greater self-reported baseline resilience were more likely to experience improvement or remission from depression with antidepressant treatment.¹⁴ This is congruent with conceptualizations of resilience as “the ability to adapt to and recover from stress.”^14,15 Of the 4 identified resilience factors (grit, adaptive coping, accommodative coping, and spirituality), it appears that accommodative coping predicts LLD treatment response and remission.¹⁴ The unique ability to accommodate is associated with better mental health outcomes in the face of uncontrollable stress.^14,16-18 Older adults appear to engage in more accommodative coping due to frequent uncontrollable stress and aging-related physiological changes (eg, sleep changes, chronic pain, declining cognition). This could make accommodative coping especially important in this population.^14,19

The Figure, adapted from Weisenbach et al,⁹ exhibits factors that contribute to LLD, including cerebrovascular disease, neurodegeneration, and chronic inflammation, all of which can lead to a vulnerable aging brain that is at higher risk for depression, particularly within the context of stress. Clinical and neurocognitive factors associated with resilience can help buffer vulnerable brains from developing depression.

Neurobiological biomarkers of resilience in LLD

Psychobiological consequences can add to existing risk factors and bidirectionally interact to increase health risks, including LLD.⁶ Stress is the primary factor in examining resilience, whether through protective measures or its adverse effects on biological and psychological systems. Resilience is often seen as adaptive maintenance of homeostasis in the face of stress.⁶ Stress and resilience were examined over multiple studies through the lens of several biomarkers, including gross anatomical features, stress response (endocrine, immune, and inflammatory), and cardiovascular indicators.

Gross anatomical indicators: Findings from neuroimaging

The neurobiology underlying psychological resilience involves brain networks associated with stress response, negative affect, and emotional control.¹⁹ Increased amygdala reactivity and amygdala frontal connectivity are often implicated in neurobiological models of resilience.²⁰ Leaver et al²⁰ correlated psychological resilience measures with amygdala function in 48 depressed vs nondepressed individuals using functional magnetic resonance imaging. Specifically, they targeted the basolateral, centromedial, and superficial nuclei groups of the amygdala while comparing the 2 groups based on resilience scores (CD-RISC), depressive symptom severity, and depression status.²⁰ A significant correlation was identified between resilience and connectivity between the superficial group of amygdala nuclei and the ventral default mode network (VDMN).²⁰ High levels of psychological resilience were associated with lower basal amygdala activity and decreased connectivity between amygdala nuclei and the VDMN.²⁰ Additionally, lower depressive symptoms were associated with higher connectivity between the amygdalae and the dorsal frontal networks.²⁰ These results suggest a complex relationship between amygdala activity, dorsal frontal regions, resilience, and LLD.²⁰

Vlasova et al²¹ further addressed the multi­factorial character of psychological resilience. The associations between the 4 factors of resilience and the regional integrity of white matter in older adults with LLD were examined using diffusion-weighted MRI.²¹ Grit was found to be associated with greater white matter integrity in the genu of the corpus callosum and cingulum bundle in LLD.²¹ There was also a positive association between grit and fractional anisotropy (FA) in the callosal region connecting the prefrontal cortex and FA in the cingulum fibers.²¹ However, results regarding the FA in the cingulum fibers did not survive correction for multiple comparisons and should be considered with caution, pending further research.²¹

Continue to: Stress response biomarkers of resilience

Stress response biomarkers include endocrine, immune, and inflammatory indices. Stress has been identified as a factor in inflammatory responses. Stress-related overstimulation of the HPA axis may increase the risk of LLD.²² Numerous studies have demonstrated an association between increased levels of peripheral proinflammatory cytokines and depressive symptoms in older adults.²³ Interleukin-6 (IL-6) has been increasingly linked with depressive symptoms and poor memory performance in older adults.⁹ There also appears to be an interaction of inflammatory and vascular processes predisposing to LLD, as increased levels of IL-6 and C-reactive protein have been associated with higher white matter pathology.⁹ Additionally, proinflammatory cytokines impact monoamine neurotransmitter pathways, leading to a reduction in tryptophan and serotonin synthesis, disruption of glucocorticoid receptors, and a decrease in hippocampal neurotrophic support.⁹ Alexopoulos et al²⁴ further explain that a prolonged CNS immune response can affect emotional and cognitive network functions related to LLD and has a role in the etiology of depressive symptoms in older adults.

Cardiovascular comorbidity and autonomic nervous system dysfunction

Many studies have revealed evidence of a bidirectional association between cardio­vascular disease and depression.²⁵ Dysregulation of the autonomic nervous system (ANS) is an underlying mechanism that could explain the link between cardiovascular risk and MDD via heart rate variability (HRV), though research examining age-related capacities provide conflicting data.^25,26 HRV is a surrogate index of resting cardiac vagal outflow that represents the ability of the ANS to adapt to psychological, social, and physical environmental changes.²⁷ Higher overall HRV is associated with greater self-regulating capacity, including behavioral, cognitive, and emotional control.²⁸ Additionally, higher HRV may serve as a biomarker of resilience to the development of stress-related disorders such as MDD. Recent studies have shown an overall reduction in HRV in older adults with LLD.²⁹ When high- and low-frequency HRV were investigated separately, only low-frequency HRV was significantly reduced in patients with depression.²⁹ One explanation is that older adults with depression have impaired or reduced baroreflex sensitivity and gain, which is often associated with an increased risk of mortality following cardiac events.³⁰ More research is needed to examine the complex processes required to better characterize the correlation between resilience in cardiovascular disease and autonomic dysfunction.

The Box^6,31,32 describes the relationship between markers of cellular health and resilience.

Box

Mind-body therapies

There is increasing interest in improving older adults’ physical and emotional well-being while promoting resilience through stress-reducing lifestyle interventions such as MBTs.³³ Because MBTs are often considered a natural and safer option compared to conventional medicine, these interventions are rapidly gaining popularity in the United States.^33,34 According to a 2017 National Health Survey, there were 5% to 10% increases in the use of yoga, meditation, and chiropractic care from 2012 to 2017, with growing evidence supporting MBTs as minimally invasive, cost-effective approaches for managing stress and neurocognitive disorders.³⁵ In contrast to pharmacologic approaches, MBTs can be used to train individuals to self-regulate in the face of adversity and stress, thus increasing their resilience.

MBTs can be divided into mindful movement exercises and meditative practices. Mindful movement exercises include yoga, tai chi, and qigong. Meditative practices that do not include movement include progressive relaxation, mindfulness, meditation, and acceptance therapies. On average, both mindful movement exercise (eg, yoga) and multicomponent mindfulness-based interventions (eg, mindfulness-based cognitive therapy, mindfulness-based stress reduction [MBSR], and mindfulness-based relapse prevention) can be as effective as other active treatments for psychiatric disorders such as MDD, anxiety, and substance use disorders.^36,37 MBSR specifically has been shown to increase empathy, self-control, self-compassion, relationship quality, mindfulness, and spirituality as well as decrease rumination in healthy older adults.³⁸ This suggests that MBSR can help strengthen the 4 factors of resilience.

Continue to: Research has also begun...

Research has also begun to evaluate the neurobiological mechanisms by which meditative therapies enhance resilience in mental health disorders, and several promising mechanistic domains (neural, hormonal, immune, cellular, and cardiovascular) have been identified.³⁹ The physical yoga discipline includes asanas (postures), pranayama (breathing techniques), and dhyana (meditation). With the inclusion of mindfulness training, yoga involves the practice of meditation as well as the dynamic combination of proprioceptive and interoceptive awareness, resulting in both attention and profound focus.⁴⁰ Dedicated yoga practice allows an individual to develop skills to withdraw the senses (pratyahara), concentrate the mind (dharana), and establish unwavering awareness (dhyana).⁴¹ The physical and cognitive benefits associated with yoga and mindfulness may be due to mechanisms including pranayama and activation of the parasympathetic nervous system; meditative or contemplative practices; increased body perception; stronger functional connectivity within the basal ganglia; or neuroplastic effects of increased grey matter volume and amygdala with regional enlargement.⁴¹ The new learning aspect of yoga practice may contribute to enhancing or improving various aspects of cognition, although the mechanisms are yet to be clarified.

Continued research in this area will promote the integration of MBTs into mainstream clinical practice and help alleviate the increased chronic health burden of an aging population. In the face of the COVID-19 pandemic, public interest in improving resilience and mental health⁴² can be supported by MBTs that can improve coping with the stress of the pandemic and enhance critical organ function (eg, lungs, heart, brain).^43,44 As a result of these limitations, many resources and health care services have used telehealth and virtual platforms to adapt to these challenges and continue offering MBTs.⁴⁵

Enhancing resilience to improve clinical outcomes

Increasing our understanding of clinical, neurocognitive, and neurobiological markers of resilience in older adults with and without depression could inform the development of interventions that treat and prevent mood and cognitive disorders of aging. Furthermore, stress reduction, decreased inflammation, and improved emotional regulation may have direct neuroplastic effects on the brain, leading to greater resilience. Complementary use of MBTs combined with standard antidepressant treatment may allow for additional improvement in clinical outcomes of LLD, including resilience, quality of life, general health, and cognitive function. Additional research testing the efficacy of those interventions designed to improve resilience in older adults with mood and mental disorders is needed.

Bottom Line

Identifying the clinical, neurocognitive, and neurobiological biomarkers of resilience in late-life depression could aid in the development of targeted interventions that treat and prevent mood and cognitive disorders of aging. Mind-body interventions can help boost resilience and improve outcomes in geriatric patients with mood and cognitive disorders.

Related Resources

• Lavretsky H. Resilience and Aging: Research and Practice. Johns Hopkins University Press; 2014.
• Lavretsky H, Sajatovic M, Reynolds CF, eds. Complementary and Integrative Therapies for Mental Health and Aging. Oxford University Press; 2016.
• Eyre HA, Berk M, Lavretsky H, et al, eds. Convergence Mental Health: A Transdisciplinary Approach to Innovation. Oxford University Press; 2021.
• UCLA Jane & Terry Semel Institute for Neuroscience & Human Behavior. Late-life Depression, Stress, and Wellness Research Program. https://www.semel.ucla.edu/latelife

Resilience has been defined as the ability to adapt and thrive in the face of adversity, acute stress, or trauma.¹ Originally conceived as an inborn trait characteristic, resilience is now conceptualized as a dynamic, multidimensional capacity influenced by the interactions between internal factors (eg, personality, cognitive capacity, physical health) and environmental resources (eg, social status, financial stability).^2,3 Resilience in older adults (typically defined as age ≥65) can improve the prognosis and outcomes for physical and mental conditions.⁴ The construct is closely aligned with “successful aging” and can be fostered in older adults, leading to improved physical and mental health and well-being.⁵

While initially resilience was conceptualized as the opposite of depressive states, recent research has identified resilience in the context of major depressive disorder (MDD) as the net effects of various psychosocial and biological variables that decrease the risk of onset, relapse, or depressive illness severity and increase the probability or speed of recovery.⁶ Late-life depression (LLD) in adults age >65 is a common and debilitating disease, often leading to decreased psychological well-being, increased cognitive decline, and excess mortality.^7,8 LLD is associated with several factors, such as cerebrovascular disease, neurodegenerative disease, and inflammation, all of which could contribute to brain vulnerability and an increased risk of depression.⁹ Physical and cognitive engagement, physical activity, and high brain reserve have been shown to confer resilience to affective and cognitive changes in older adults, despite brain vulnerability.⁹

The greatest levels of resilience have been observed in individuals in their fifth decade of life and later,^4,10 with high levels of resilience significantly contributing to longevity⁵; however, little is known about which factors contribute to heterogeneity in resilience characteristics and outcomes.⁴ Furthermore, the concept of resilience continues to raise numerous questions, including:

• how resilience should be measured or defined
• what factors promote or deter the development of resilience
• the effects of resilience on various health and psychological outcomes
• which interventions are effective in enhancing resilience in older adults.⁴

In this article, we describe resilience in older adults with LLD, its clinical and neurocognitive correlates, and underlying neurobiological and immunological biomarkers. We also examine resilience-building interventions, such as mind-body therapies (MBTs), that have been shown to enhance resilience by promoting positive perceptions of difficult experiences and challenges.

Clinical and neurocognitive correlates of resilience

Resilience varies substantially among older adults with LLD as well as across the lifespan of an individual.¹¹ Identifying clinical components and predictors of resilience may usefully inform the development and testing of interventions to prevent and treat LLD.¹¹ One tool widely used to measure resilience—the self-report Connor-Davidson Resilience Scale (CD-RISC)¹²— has been found to have clinically relevant characteristics.^1,11 Using data from 337 older adults with LLD, Laird et al¹¹ performed an exploratory factor analysis of the CD-RISC and found a 4-factor model:

• grit
• adaptive coping self-efficacy
• accommodative coping self-efficacy
• spirituality.^1,11

Having a strong sense of purpose and not being easily discouraged by failure were items characteristic of grit.^1,11 The preference to take the lead in problem-solving was typical of items loading on adaptive coping self-efficacy, while accommodative coping self-efficacy measured flexibility, cognitive reframing, a sense of humor, and acceptance in the face of uncontrollable stress.^1,11 Finally, the belief that “things happen for a reason” and that “sometimes fate or God can help me” are characteristics of spirituality. ^1,11 Using a multivariate model, the greatest variance in total resilience scores was explained by less depression, less apathy, higher quality of life, non-White race, and, somewhat counterintuitively, greater medical comorbidity.^1,11 Thus, interventions designed to help older adults cultivate grit, active coping, accommodative coping, and spirituality may enhance resilience in LLD.^1,11

Resilience may also be positively associated with cognitive functioning and could be neuroprotective in LLD.¹³ Laird et al¹³ investigated associations between baseline resilience and several domains of neurocognitive functioning in 288 older adults with LLD. Several positive associations were found between measured language performance and total resilience, active coping, and accommodative coping.¹³ Additionally, total resilience and accommodative coping were significantly associated with a lower self-reported frequency of forgetfulness, a subjective measure of memory used in this study.¹³ Together, these results suggest that interventions targeting language might be useful to improve coping in LLD.¹³ Another interesting finding was that the resilience subdomain of spirituality was negatively associated with memory, language, and executive functioning performance.¹³ A distinction must be made between religious attendance (eg, regular attendance at religious institutions) vs religious beliefs, which may account for the previously reported associations between spirituality and improved cognition.¹³

Continue to: Self-reported resilience...

Self-reported resilience may also predict greater responsivity to antidepressant medication in patients with LLD.¹⁴ Older adults with LLD and greater self-reported baseline resilience were more likely to experience improvement or remission from depression with antidepressant treatment.¹⁴ This is congruent with conceptualizations of resilience as “the ability to adapt to and recover from stress.”^14,15 Of the 4 identified resilience factors (grit, adaptive coping, accommodative coping, and spirituality), it appears that accommodative coping predicts LLD treatment response and remission.¹⁴ The unique ability to accommodate is associated with better mental health outcomes in the face of uncontrollable stress.^14,16-18 Older adults appear to engage in more accommodative coping due to frequent uncontrollable stress and aging-related physiological changes (eg, sleep changes, chronic pain, declining cognition). This could make accommodative coping especially important in this population.^14,19

The Figure, adapted from Weisenbach et al,⁹ exhibits factors that contribute to LLD, including cerebrovascular disease, neurodegeneration, and chronic inflammation, all of which can lead to a vulnerable aging brain that is at higher risk for depression, particularly within the context of stress. Clinical and neurocognitive factors associated with resilience can help buffer vulnerable brains from developing depression.

Neurobiological biomarkers of resilience in LLD

Psychobiological consequences can add to existing risk factors and bidirectionally interact to increase health risks, including LLD.⁶ Stress is the primary factor in examining resilience, whether through protective measures or its adverse effects on biological and psychological systems. Resilience is often seen as adaptive maintenance of homeostasis in the face of stress.⁶ Stress and resilience were examined over multiple studies through the lens of several biomarkers, including gross anatomical features, stress response (endocrine, immune, and inflammatory), and cardiovascular indicators.

Gross anatomical indicators: Findings from neuroimaging

The neurobiology underlying psychological resilience involves brain networks associated with stress response, negative affect, and emotional control.¹⁹ Increased amygdala reactivity and amygdala frontal connectivity are often implicated in neurobiological models of resilience.²⁰ Leaver et al²⁰ correlated psychological resilience measures with amygdala function in 48 depressed vs nondepressed individuals using functional magnetic resonance imaging. Specifically, they targeted the basolateral, centromedial, and superficial nuclei groups of the amygdala while comparing the 2 groups based on resilience scores (CD-RISC), depressive symptom severity, and depression status.²⁰ A significant correlation was identified between resilience and connectivity between the superficial group of amygdala nuclei and the ventral default mode network (VDMN).²⁰ High levels of psychological resilience were associated with lower basal amygdala activity and decreased connectivity between amygdala nuclei and the VDMN.²⁰ Additionally, lower depressive symptoms were associated with higher connectivity between the amygdalae and the dorsal frontal networks.²⁰ These results suggest a complex relationship between amygdala activity, dorsal frontal regions, resilience, and LLD.²⁰

Vlasova et al²¹ further addressed the multi­factorial character of psychological resilience. The associations between the 4 factors of resilience and the regional integrity of white matter in older adults with LLD were examined using diffusion-weighted MRI.²¹ Grit was found to be associated with greater white matter integrity in the genu of the corpus callosum and cingulum bundle in LLD.²¹ There was also a positive association between grit and fractional anisotropy (FA) in the callosal region connecting the prefrontal cortex and FA in the cingulum fibers.²¹ However, results regarding the FA in the cingulum fibers did not survive correction for multiple comparisons and should be considered with caution, pending further research.²¹

Continue to: Stress response biomarkers of resilience

Stress response biomarkers include endocrine, immune, and inflammatory indices. Stress has been identified as a factor in inflammatory responses. Stress-related overstimulation of the HPA axis may increase the risk of LLD.²² Numerous studies have demonstrated an association between increased levels of peripheral proinflammatory cytokines and depressive symptoms in older adults.²³ Interleukin-6 (IL-6) has been increasingly linked with depressive symptoms and poor memory performance in older adults.⁹ There also appears to be an interaction of inflammatory and vascular processes predisposing to LLD, as increased levels of IL-6 and C-reactive protein have been associated with higher white matter pathology.⁹ Additionally, proinflammatory cytokines impact monoamine neurotransmitter pathways, leading to a reduction in tryptophan and serotonin synthesis, disruption of glucocorticoid receptors, and a decrease in hippocampal neurotrophic support.⁹ Alexopoulos et al²⁴ further explain that a prolonged CNS immune response can affect emotional and cognitive network functions related to LLD and has a role in the etiology of depressive symptoms in older adults.

Cardiovascular comorbidity and autonomic nervous system dysfunction

Many studies have revealed evidence of a bidirectional association between cardio­vascular disease and depression.²⁵ Dysregulation of the autonomic nervous system (ANS) is an underlying mechanism that could explain the link between cardiovascular risk and MDD via heart rate variability (HRV), though research examining age-related capacities provide conflicting data.^25,26 HRV is a surrogate index of resting cardiac vagal outflow that represents the ability of the ANS to adapt to psychological, social, and physical environmental changes.²⁷ Higher overall HRV is associated with greater self-regulating capacity, including behavioral, cognitive, and emotional control.²⁸ Additionally, higher HRV may serve as a biomarker of resilience to the development of stress-related disorders such as MDD. Recent studies have shown an overall reduction in HRV in older adults with LLD.²⁹ When high- and low-frequency HRV were investigated separately, only low-frequency HRV was significantly reduced in patients with depression.²⁹ One explanation is that older adults with depression have impaired or reduced baroreflex sensitivity and gain, which is often associated with an increased risk of mortality following cardiac events.³⁰ More research is needed to examine the complex processes required to better characterize the correlation between resilience in cardiovascular disease and autonomic dysfunction.

The Box^6,31,32 describes the relationship between markers of cellular health and resilience.

Box

Mind-body therapies

There is increasing interest in improving older adults’ physical and emotional well-being while promoting resilience through stress-reducing lifestyle interventions such as MBTs.³³ Because MBTs are often considered a natural and safer option compared to conventional medicine, these interventions are rapidly gaining popularity in the United States.^33,34 According to a 2017 National Health Survey, there were 5% to 10% increases in the use of yoga, meditation, and chiropractic care from 2012 to 2017, with growing evidence supporting MBTs as minimally invasive, cost-effective approaches for managing stress and neurocognitive disorders.³⁵ In contrast to pharmacologic approaches, MBTs can be used to train individuals to self-regulate in the face of adversity and stress, thus increasing their resilience.

MBTs can be divided into mindful movement exercises and meditative practices. Mindful movement exercises include yoga, tai chi, and qigong. Meditative practices that do not include movement include progressive relaxation, mindfulness, meditation, and acceptance therapies. On average, both mindful movement exercise (eg, yoga) and multicomponent mindfulness-based interventions (eg, mindfulness-based cognitive therapy, mindfulness-based stress reduction [MBSR], and mindfulness-based relapse prevention) can be as effective as other active treatments for psychiatric disorders such as MDD, anxiety, and substance use disorders.^36,37 MBSR specifically has been shown to increase empathy, self-control, self-compassion, relationship quality, mindfulness, and spirituality as well as decrease rumination in healthy older adults.³⁸ This suggests that MBSR can help strengthen the 4 factors of resilience.

Continue to: Research has also begun...

Research has also begun to evaluate the neurobiological mechanisms by which meditative therapies enhance resilience in mental health disorders, and several promising mechanistic domains (neural, hormonal, immune, cellular, and cardiovascular) have been identified.³⁹ The physical yoga discipline includes asanas (postures), pranayama (breathing techniques), and dhyana (meditation). With the inclusion of mindfulness training, yoga involves the practice of meditation as well as the dynamic combination of proprioceptive and interoceptive awareness, resulting in both attention and profound focus.⁴⁰ Dedicated yoga practice allows an individual to develop skills to withdraw the senses (pratyahara), concentrate the mind (dharana), and establish unwavering awareness (dhyana).⁴¹ The physical and cognitive benefits associated with yoga and mindfulness may be due to mechanisms including pranayama and activation of the parasympathetic nervous system; meditative or contemplative practices; increased body perception; stronger functional connectivity within the basal ganglia; or neuroplastic effects of increased grey matter volume and amygdala with regional enlargement.⁴¹ The new learning aspect of yoga practice may contribute to enhancing or improving various aspects of cognition, although the mechanisms are yet to be clarified.

Continued research in this area will promote the integration of MBTs into mainstream clinical practice and help alleviate the increased chronic health burden of an aging population. In the face of the COVID-19 pandemic, public interest in improving resilience and mental health⁴² can be supported by MBTs that can improve coping with the stress of the pandemic and enhance critical organ function (eg, lungs, heart, brain).^43,44 As a result of these limitations, many resources and health care services have used telehealth and virtual platforms to adapt to these challenges and continue offering MBTs.⁴⁵

Enhancing resilience to improve clinical outcomes

Increasing our understanding of clinical, neurocognitive, and neurobiological markers of resilience in older adults with and without depression could inform the development of interventions that treat and prevent mood and cognitive disorders of aging. Furthermore, stress reduction, decreased inflammation, and improved emotional regulation may have direct neuroplastic effects on the brain, leading to greater resilience. Complementary use of MBTs combined with standard antidepressant treatment may allow for additional improvement in clinical outcomes of LLD, including resilience, quality of life, general health, and cognitive function. Additional research testing the efficacy of those interventions designed to improve resilience in older adults with mood and mental disorders is needed.

Bottom Line

Identifying the clinical, neurocognitive, and neurobiological biomarkers of resilience in late-life depression could aid in the development of targeted interventions that treat and prevent mood and cognitive disorders of aging. Mind-body interventions can help boost resilience and improve outcomes in geriatric patients with mood and cognitive disorders.

Related Resources

• Lavretsky H. Resilience and Aging: Research and Practice. Johns Hopkins University Press; 2014.
• Lavretsky H, Sajatovic M, Reynolds CF, eds. Complementary and Integrative Therapies for Mental Health and Aging. Oxford University Press; 2016.
• Eyre HA, Berk M, Lavretsky H, et al, eds. Convergence Mental Health: A Transdisciplinary Approach to Innovation. Oxford University Press; 2021.
• UCLA Jane & Terry Semel Institute for Neuroscience & Human Behavior. Late-life Depression, Stress, and Wellness Research Program. https://www.semel.ucla.edu/latelife

Resilience has been defined as the ability to adapt and thrive in the face of adversity, acute stress, or trauma.¹ Originally conceived as an inborn trait characteristic, resilience is now conceptualized as a dynamic, multidimensional capacity influenced by the interactions between internal factors (eg, personality, cognitive capacity, physical health) and environmental resources (eg, social status, financial stability).^2,3 Resilience in older adults (typically defined as age ≥65) can improve the prognosis and outcomes for physical and mental conditions.⁴ The construct is closely aligned with “successful aging” and can be fostered in older adults, leading to improved physical and mental health and well-being.⁵

While initially resilience was conceptualized as the opposite of depressive states, recent research has identified resilience in the context of major depressive disorder (MDD) as the net effects of various psychosocial and biological variables that decrease the risk of onset, relapse, or depressive illness severity and increase the probability or speed of recovery.⁶ Late-life depression (LLD) in adults age >65 is a common and debilitating disease, often leading to decreased psychological well-being, increased cognitive decline, and excess mortality.^7,8 LLD is associated with several factors, such as cerebrovascular disease, neurodegenerative disease, and inflammation, all of which could contribute to brain vulnerability and an increased risk of depression.⁹ Physical and cognitive engagement, physical activity, and high brain reserve have been shown to confer resilience to affective and cognitive changes in older adults, despite brain vulnerability.⁹

The greatest levels of resilience have been observed in individuals in their fifth decade of life and later,^4,10 with high levels of resilience significantly contributing to longevity⁵; however, little is known about which factors contribute to heterogeneity in resilience characteristics and outcomes.⁴ Furthermore, the concept of resilience continues to raise numerous questions, including:

• how resilience should be measured or defined
• what factors promote or deter the development of resilience
• the effects of resilience on various health and psychological outcomes
• which interventions are effective in enhancing resilience in older adults.⁴

In this article, we describe resilience in older adults with LLD, its clinical and neurocognitive correlates, and underlying neurobiological and immunological biomarkers. We also examine resilience-building interventions, such as mind-body therapies (MBTs), that have been shown to enhance resilience by promoting positive perceptions of difficult experiences and challenges.

Clinical and neurocognitive correlates of resilience

Resilience varies substantially among older adults with LLD as well as across the lifespan of an individual.¹¹ Identifying clinical components and predictors of resilience may usefully inform the development and testing of interventions to prevent and treat LLD.¹¹ One tool widely used to measure resilience—the self-report Connor-Davidson Resilience Scale (CD-RISC)¹²— has been found to have clinically relevant characteristics.^1,11 Using data from 337 older adults with LLD, Laird et al¹¹ performed an exploratory factor analysis of the CD-RISC and found a 4-factor model:

• grit
• adaptive coping self-efficacy
• accommodative coping self-efficacy
• spirituality.^1,11

Having a strong sense of purpose and not being easily discouraged by failure were items characteristic of grit.^1,11 The preference to take the lead in problem-solving was typical of items loading on adaptive coping self-efficacy, while accommodative coping self-efficacy measured flexibility, cognitive reframing, a sense of humor, and acceptance in the face of uncontrollable stress.^1,11 Finally, the belief that “things happen for a reason” and that “sometimes fate or God can help me” are characteristics of spirituality. ^1,11 Using a multivariate model, the greatest variance in total resilience scores was explained by less depression, less apathy, higher quality of life, non-White race, and, somewhat counterintuitively, greater medical comorbidity.^1,11 Thus, interventions designed to help older adults cultivate grit, active coping, accommodative coping, and spirituality may enhance resilience in LLD.^1,11

Resilience may also be positively associated with cognitive functioning and could be neuroprotective in LLD.¹³ Laird et al¹³ investigated associations between baseline resilience and several domains of neurocognitive functioning in 288 older adults with LLD. Several positive associations were found between measured language performance and total resilience, active coping, and accommodative coping.¹³ Additionally, total resilience and accommodative coping were significantly associated with a lower self-reported frequency of forgetfulness, a subjective measure of memory used in this study.¹³ Together, these results suggest that interventions targeting language might be useful to improve coping in LLD.¹³ Another interesting finding was that the resilience subdomain of spirituality was negatively associated with memory, language, and executive functioning performance.¹³ A distinction must be made between religious attendance (eg, regular attendance at religious institutions) vs religious beliefs, which may account for the previously reported associations between spirituality and improved cognition.¹³

Continue to: Self-reported resilience...

Self-reported resilience may also predict greater responsivity to antidepressant medication in patients with LLD.¹⁴ Older adults with LLD and greater self-reported baseline resilience were more likely to experience improvement or remission from depression with antidepressant treatment.¹⁴ This is congruent with conceptualizations of resilience as “the ability to adapt to and recover from stress.”^14,15 Of the 4 identified resilience factors (grit, adaptive coping, accommodative coping, and spirituality), it appears that accommodative coping predicts LLD treatment response and remission.¹⁴ The unique ability to accommodate is associated with better mental health outcomes in the face of uncontrollable stress.^14,16-18 Older adults appear to engage in more accommodative coping due to frequent uncontrollable stress and aging-related physiological changes (eg, sleep changes, chronic pain, declining cognition). This could make accommodative coping especially important in this population.^14,19

The Figure, adapted from Weisenbach et al,⁹ exhibits factors that contribute to LLD, including cerebrovascular disease, neurodegeneration, and chronic inflammation, all of which can lead to a vulnerable aging brain that is at higher risk for depression, particularly within the context of stress. Clinical and neurocognitive factors associated with resilience can help buffer vulnerable brains from developing depression.

Neurobiological biomarkers of resilience in LLD

Psychobiological consequences can add to existing risk factors and bidirectionally interact to increase health risks, including LLD.⁶ Stress is the primary factor in examining resilience, whether through protective measures or its adverse effects on biological and psychological systems. Resilience is often seen as adaptive maintenance of homeostasis in the face of stress.⁶ Stress and resilience were examined over multiple studies through the lens of several biomarkers, including gross anatomical features, stress response (endocrine, immune, and inflammatory), and cardiovascular indicators.

Gross anatomical indicators: Findings from neuroimaging

The neurobiology underlying psychological resilience involves brain networks associated with stress response, negative affect, and emotional control.¹⁹ Increased amygdala reactivity and amygdala frontal connectivity are often implicated in neurobiological models of resilience.²⁰ Leaver et al²⁰ correlated psychological resilience measures with amygdala function in 48 depressed vs nondepressed individuals using functional magnetic resonance imaging. Specifically, they targeted the basolateral, centromedial, and superficial nuclei groups of the amygdala while comparing the 2 groups based on resilience scores (CD-RISC), depressive symptom severity, and depression status.²⁰ A significant correlation was identified between resilience and connectivity between the superficial group of amygdala nuclei and the ventral default mode network (VDMN).²⁰ High levels of psychological resilience were associated with lower basal amygdala activity and decreased connectivity between amygdala nuclei and the VDMN.²⁰ Additionally, lower depressive symptoms were associated with higher connectivity between the amygdalae and the dorsal frontal networks.²⁰ These results suggest a complex relationship between amygdala activity, dorsal frontal regions, resilience, and LLD.²⁰

Vlasova et al²¹ further addressed the multi­factorial character of psychological resilience. The associations between the 4 factors of resilience and the regional integrity of white matter in older adults with LLD were examined using diffusion-weighted MRI.²¹ Grit was found to be associated with greater white matter integrity in the genu of the corpus callosum and cingulum bundle in LLD.²¹ There was also a positive association between grit and fractional anisotropy (FA) in the callosal region connecting the prefrontal cortex and FA in the cingulum fibers.²¹ However, results regarding the FA in the cingulum fibers did not survive correction for multiple comparisons and should be considered with caution, pending further research.²¹

Continue to: Stress response biomarkers of resilience

Stress response biomarkers include endocrine, immune, and inflammatory indices. Stress has been identified as a factor in inflammatory responses. Stress-related overstimulation of the HPA axis may increase the risk of LLD.²² Numerous studies have demonstrated an association between increased levels of peripheral proinflammatory cytokines and depressive symptoms in older adults.²³ Interleukin-6 (IL-6) has been increasingly linked with depressive symptoms and poor memory performance in older adults.⁹ There also appears to be an interaction of inflammatory and vascular processes predisposing to LLD, as increased levels of IL-6 and C-reactive protein have been associated with higher white matter pathology.⁹ Additionally, proinflammatory cytokines impact monoamine neurotransmitter pathways, leading to a reduction in tryptophan and serotonin synthesis, disruption of glucocorticoid receptors, and a decrease in hippocampal neurotrophic support.⁹ Alexopoulos et al²⁴ further explain that a prolonged CNS immune response can affect emotional and cognitive network functions related to LLD and has a role in the etiology of depressive symptoms in older adults.

Cardiovascular comorbidity and autonomic nervous system dysfunction

Many studies have revealed evidence of a bidirectional association between cardio­vascular disease and depression.²⁵ Dysregulation of the autonomic nervous system (ANS) is an underlying mechanism that could explain the link between cardiovascular risk and MDD via heart rate variability (HRV), though research examining age-related capacities provide conflicting data.^25,26 HRV is a surrogate index of resting cardiac vagal outflow that represents the ability of the ANS to adapt to psychological, social, and physical environmental changes.²⁷ Higher overall HRV is associated with greater self-regulating capacity, including behavioral, cognitive, and emotional control.²⁸ Additionally, higher HRV may serve as a biomarker of resilience to the development of stress-related disorders such as MDD. Recent studies have shown an overall reduction in HRV in older adults with LLD.²⁹ When high- and low-frequency HRV were investigated separately, only low-frequency HRV was significantly reduced in patients with depression.²⁹ One explanation is that older adults with depression have impaired or reduced baroreflex sensitivity and gain, which is often associated with an increased risk of mortality following cardiac events.³⁰ More research is needed to examine the complex processes required to better characterize the correlation between resilience in cardiovascular disease and autonomic dysfunction.

The Box^6,31,32 describes the relationship between markers of cellular health and resilience.

Box

Mind-body therapies

There is increasing interest in improving older adults’ physical and emotional well-being while promoting resilience through stress-reducing lifestyle interventions such as MBTs.³³ Because MBTs are often considered a natural and safer option compared to conventional medicine, these interventions are rapidly gaining popularity in the United States.^33,34 According to a 2017 National Health Survey, there were 5% to 10% increases in the use of yoga, meditation, and chiropractic care from 2012 to 2017, with growing evidence supporting MBTs as minimally invasive, cost-effective approaches for managing stress and neurocognitive disorders.³⁵ In contrast to pharmacologic approaches, MBTs can be used to train individuals to self-regulate in the face of adversity and stress, thus increasing their resilience.

MBTs can be divided into mindful movement exercises and meditative practices. Mindful movement exercises include yoga, tai chi, and qigong. Meditative practices that do not include movement include progressive relaxation, mindfulness, meditation, and acceptance therapies. On average, both mindful movement exercise (eg, yoga) and multicomponent mindfulness-based interventions (eg, mindfulness-based cognitive therapy, mindfulness-based stress reduction [MBSR], and mindfulness-based relapse prevention) can be as effective as other active treatments for psychiatric disorders such as MDD, anxiety, and substance use disorders.^36,37 MBSR specifically has been shown to increase empathy, self-control, self-compassion, relationship quality, mindfulness, and spirituality as well as decrease rumination in healthy older adults.³⁸ This suggests that MBSR can help strengthen the 4 factors of resilience.

Continue to: Research has also begun...

Research has also begun to evaluate the neurobiological mechanisms by which meditative therapies enhance resilience in mental health disorders, and several promising mechanistic domains (neural, hormonal, immune, cellular, and cardiovascular) have been identified.³⁹ The physical yoga discipline includes asanas (postures), pranayama (breathing techniques), and dhyana (meditation). With the inclusion of mindfulness training, yoga involves the practice of meditation as well as the dynamic combination of proprioceptive and interoceptive awareness, resulting in both attention and profound focus.⁴⁰ Dedicated yoga practice allows an individual to develop skills to withdraw the senses (pratyahara), concentrate the mind (dharana), and establish unwavering awareness (dhyana).⁴¹ The physical and cognitive benefits associated with yoga and mindfulness may be due to mechanisms including pranayama and activation of the parasympathetic nervous system; meditative or contemplative practices; increased body perception; stronger functional connectivity within the basal ganglia; or neuroplastic effects of increased grey matter volume and amygdala with regional enlargement.⁴¹ The new learning aspect of yoga practice may contribute to enhancing or improving various aspects of cognition, although the mechanisms are yet to be clarified.

Continued research in this area will promote the integration of MBTs into mainstream clinical practice and help alleviate the increased chronic health burden of an aging population. In the face of the COVID-19 pandemic, public interest in improving resilience and mental health⁴² can be supported by MBTs that can improve coping with the stress of the pandemic and enhance critical organ function (eg, lungs, heart, brain).^43,44 As a result of these limitations, many resources and health care services have used telehealth and virtual platforms to adapt to these challenges and continue offering MBTs.⁴⁵

Enhancing resilience to improve clinical outcomes

Increasing our understanding of clinical, neurocognitive, and neurobiological markers of resilience in older adults with and without depression could inform the development of interventions that treat and prevent mood and cognitive disorders of aging. Furthermore, stress reduction, decreased inflammation, and improved emotional regulation may have direct neuroplastic effects on the brain, leading to greater resilience. Complementary use of MBTs combined with standard antidepressant treatment may allow for additional improvement in clinical outcomes of LLD, including resilience, quality of life, general health, and cognitive function. Additional research testing the efficacy of those interventions designed to improve resilience in older adults with mood and mental disorders is needed.

Bottom Line

Identifying the clinical, neurocognitive, and neurobiological biomarkers of resilience in late-life depression could aid in the development of targeted interventions that treat and prevent mood and cognitive disorders of aging. Mind-body interventions can help boost resilience and improve outcomes in geriatric patients with mood and cognitive disorders.

Related Resources

• Lavretsky H. Resilience and Aging: Research and Practice. Johns Hopkins University Press; 2014.
• Lavretsky H, Sajatovic M, Reynolds CF, eds. Complementary and Integrative Therapies for Mental Health and Aging. Oxford University Press; 2016.
• Eyre HA, Berk M, Lavretsky H, et al, eds. Convergence Mental Health: A Transdisciplinary Approach to Innovation. Oxford University Press; 2021.
• UCLA Jane & Terry Semel Institute for Neuroscience & Human Behavior. Late-life Depression, Stress, and Wellness Research Program. https://www.semel.ucla.edu/latelife

Hypercalcemia is a well-known but underrecognized adverse effect of lithium. Most patients with lithium-associated hypercalcemia (LAH) have either nonspecific symptoms (eg, persistent tiredness, constipation, polyuria, polydipsia) or no symptoms. Clinically, LAH differs from primary hyperparathyroidism, though the management protocol of these 2 conditions is almost the same. In this article, we discuss how lithium can affect calcium and parathyroid hormone (PTH) levels and how LAH and lithium-associated hyperparathyroidism (LAHP) differs from primary hyperparathyroidism. We also outline a suggested approach to monitoring and management.

An insidious problem

Due to the varying definitions and methods used to assess hypercalcemia, the reported prevalence of LAH varies from 4.3% to 80%.¹ McKnight et al² conducted a systematic review and meta-analysis of studies of the relationship between lithium and parathyroid function that included 14 case-control studies, 36 case reports, and 6 cross-sectional studies without a control group. They found that the levels of calcium and PTH were 10% higher in lithium-treated patients than in controls.²

Pathophysiology. Lithium is known to increase both calcium and PTH levels. PTH is responsible for calcium homeostasis. It is secreted in response to low calcium levels, which it increases by its action on bones, intestines, and kidneys. Vitamin D also plays a crucial role in calcium homeostasis. A deficiency of vitamin D triggers a compensatory increase in PTH to maintain calcium levels.³

Calcium and PTH levels increase soon after administration of lithium, but the rise is usually mild and insidious. In a small proportion of patients who receive long-term lithium treatment, calcium levels can exceed the normal range. Patients who develop LAH typically have serum calcium levels slightly above the normal range and PTH levels ranging from the higher side of the normal range to several times the upper limit of the normal range. Patients might also experience elevated PTH levels without any increase in calcium levels. Lithium can affect calcium and PTH levels in multiple ways. For instance, it increases the reabsorption of calcium in the kidney as well as the reset point of calcium-sensing receptors. Therefore, only higher levels of calcium can inhibit the release of PTH. Hence, in cases where the PTH level is within the normal range, it is generally higher than would be expected for a given serum calcium level. Lithium can also directly affect the parathyroid glands and can lead to either single-nodule or multimodule hyperplasia.⁴

Long-term lithium use can cause chronic kidney disease (CKD), which in turn leads to vitamin D deficiency and hyperparathyroidism. However, secondary hyperparathyroidism with CKD is usually seen in the more advanced stages of CKD, and is associated with low-to-normal calcium levels (as opposed to the high levels seen in LAH).^3-5

Lithium-associated hyperparathyroidism

Primary hyperparathyroidism is the most common cause of hypercalcemia. Its prevalence ranges from 1 to 7 cases per 1,000 adults. The incidence of LAH/LAHP is 4- to 6-fold higher compared to the general population.⁶ Similar to LAH/LAHP, primary hyperparathyroidism is more common in older adults (age >60) and females. Hence, some researchers have suggested that lithium probably unmasks hyperparathyroidism in patients who are susceptible to primary hyperparathyroidism.³

Look for these clinical manifestations

Symptoms of primary hyperparathyroidism are related to high calcium and PTH levels. They are commonly described as “painful bones, renal stones, abdominal groans (due to hypercalcemia-induced ileus), and psychic moans (lethargy, poor concentration, depression).” Common adverse outcomes associated with primary hyperparathyroidism are renal stones, high risk of fracture, constipation, peptic ulcer, and pancreatitis.^3,7

Continue: In contrast...

In contrast, LAHP is characterized by mild, intermittent, and/or persistent hypercalcemia and mildly increased PTH (Table 1).^1,3,4 In some patients, it could improve without active intervention. Because lithium increases the absorption of urinary calcium, it is associated with hypocalciuria and a lower risk of renal stones. Additionally, lithium has osteoprotective effects and has not been associated with an increased risk of fracture. Some researchers have suggested that the presentation of LAHP is more like familial hypocalciuric hypercalcemia (FHC), which is also associated with hypocalciuria. FHC is a benign condition and does not require active intervention.^3,4 Similar to those with FHC, many patients with LAHP may live with chronic asymptomatic hypercalcemia without any significant adverse outcome.

A suggested approach to monitoring

In most cases, LAH is an insidious adverse effect that is usually detected on blood tests after many years of lithium therapy.⁸ For patients starting lithium therapy, International Society of Bipolar Disorder guidelines recommend testing calcium levels at baseline, 6 months, and annually thereafter, or as clinically indicated, to detect and monitor hypercalcemia and hyperparathyroidism. However, these guidelines do not provide any recommendations regarding how to manage abnormal findings.⁹

Clinical laboratories report both total and adjusted calcium values. The adjusted calcium value takes into account albumin levels. This is a way to compensate for an abnormal concentration of albumin (establishing what a patient’s total calcium concentration would be if the albumin concentration was normal). Table 2⁵ shows the categorization of adjusted calcium values.For patients receiving lithium, some researchers have suggested monitoring PTH as well as calcium.¹

The Figure outlines our proposed approach to monitoring for LAH in patients receiving lithium. An isolated high value of calcium could be due to prolonged venous stasis if a tourniquet is used for phlebotomy. In such instances, the calcium level should be tested again without a tourniquet.¹⁰ If the repeat blood test shows elevated calcium levels, then both PTH and serum calcium should be tested.

If the PTH level is higher than the midpoint of the reference range, LAH should be suspected, though sometimes hypercalcemia can present without raised PTH. LAH has also been reported to cause a transient increase in calcium levels. If hypercalcemia frequently recurs, PTH levels should be monitored. If PTH is suppressed, then the raised calcium levels are probably secondary to something other than lithium; common reasons for this include the use of vitamin D supplements or thiazide diuretics, or malignancies such as multiple myeloma.^3,5,8

Continue to: Treatment

There are several options for treating LAH. Lithium may be continued or discontinued following close monitoring of calcium and PTH levels, with or without active interventions such as surgery or pharmacotherapy, and as deemed appropriate after consultation with an endocrinologist. The decision should be informed by evaluating the risks and benefits to the patient’s physical and mental health. LAH can be reversed by discontinuing lithium, but this might not be the case in patients receiving long-term lithium therapy, especially if their elevated calcium levels are associated with parathyroid adenomas or hyperplasia. Hence, close monitoring of calcium and PTH is required even after discontinuing lithium.^3,8

Surgical treatment. The primary treatment of LAH and primary hyperparathyroidism is parathyroidectomy. The possibility of recovery after parathyroidectomy for primary hyperparathyroidism is 60% to 80%, though a small proportion of patients might experience recurrence. This figure might be higher for LAH, because it is more likely to affect multiple glands.^1,11 Other potential complications of parathyroidectomy are recurrent laryngeal nerve injury causing paralysis of vocal cords leading to hoarseness of voice, stridor, or aspiration, and local hematoma and hypocalcemia (requiring vitamin D and/or calcium supplements).¹²

Pharmacotherapy. Cinacalcet is a calcimimetic drug that decreases the reset point of the calcium-sensing receptor. It can be used if a patient is not suitable for or apprehensive about surgical intervention.^1,8

Bottom Line

Calcium levels should be regularly monitored in patients receiving lithium. If calcium levels are persistently high, parathyroid hormone levels should also be measured. Management of lithium-associated hypercalcemia includes watchful waiting, discontinuing lithium, parathyroidectomy, and pharmacotherapy with cinacalcet.

Related Resources

• Laski M, Foreman R, Hancock H, et al. Lithium: an underutilized element. Current Psychiatry. 2021;20(12):27-30,34. doi:10.12788/cp.0193
• Pelekanos M, Foo K. A resident’s guide to lithium. Current Psychiatry. 2021;20(4):e3-e7. doi:10.12788/cp.0113

Drug Brand Names

Cinacalcet • Sensipar

Hypercalcemia is a well-known but underrecognized adverse effect of lithium. Most patients with lithium-associated hypercalcemia (LAH) have either nonspecific symptoms (eg, persistent tiredness, constipation, polyuria, polydipsia) or no symptoms. Clinically, LAH differs from primary hyperparathyroidism, though the management protocol of these 2 conditions is almost the same. In this article, we discuss how lithium can affect calcium and parathyroid hormone (PTH) levels and how LAH and lithium-associated hyperparathyroidism (LAHP) differs from primary hyperparathyroidism. We also outline a suggested approach to monitoring and management.

An insidious problem

Due to the varying definitions and methods used to assess hypercalcemia, the reported prevalence of LAH varies from 4.3% to 80%.¹ McKnight et al² conducted a systematic review and meta-analysis of studies of the relationship between lithium and parathyroid function that included 14 case-control studies, 36 case reports, and 6 cross-sectional studies without a control group. They found that the levels of calcium and PTH were 10% higher in lithium-treated patients than in controls.²

Pathophysiology. Lithium is known to increase both calcium and PTH levels. PTH is responsible for calcium homeostasis. It is secreted in response to low calcium levels, which it increases by its action on bones, intestines, and kidneys. Vitamin D also plays a crucial role in calcium homeostasis. A deficiency of vitamin D triggers a compensatory increase in PTH to maintain calcium levels.³

Calcium and PTH levels increase soon after administration of lithium, but the rise is usually mild and insidious. In a small proportion of patients who receive long-term lithium treatment, calcium levels can exceed the normal range. Patients who develop LAH typically have serum calcium levels slightly above the normal range and PTH levels ranging from the higher side of the normal range to several times the upper limit of the normal range. Patients might also experience elevated PTH levels without any increase in calcium levels. Lithium can affect calcium and PTH levels in multiple ways. For instance, it increases the reabsorption of calcium in the kidney as well as the reset point of calcium-sensing receptors. Therefore, only higher levels of calcium can inhibit the release of PTH. Hence, in cases where the PTH level is within the normal range, it is generally higher than would be expected for a given serum calcium level. Lithium can also directly affect the parathyroid glands and can lead to either single-nodule or multimodule hyperplasia.⁴

Long-term lithium use can cause chronic kidney disease (CKD), which in turn leads to vitamin D deficiency and hyperparathyroidism. However, secondary hyperparathyroidism with CKD is usually seen in the more advanced stages of CKD, and is associated with low-to-normal calcium levels (as opposed to the high levels seen in LAH).^3-5

Lithium-associated hyperparathyroidism

Primary hyperparathyroidism is the most common cause of hypercalcemia. Its prevalence ranges from 1 to 7 cases per 1,000 adults. The incidence of LAH/LAHP is 4- to 6-fold higher compared to the general population.⁶ Similar to LAH/LAHP, primary hyperparathyroidism is more common in older adults (age >60) and females. Hence, some researchers have suggested that lithium probably unmasks hyperparathyroidism in patients who are susceptible to primary hyperparathyroidism.³

Look for these clinical manifestations

Symptoms of primary hyperparathyroidism are related to high calcium and PTH levels. They are commonly described as “painful bones, renal stones, abdominal groans (due to hypercalcemia-induced ileus), and psychic moans (lethargy, poor concentration, depression).” Common adverse outcomes associated with primary hyperparathyroidism are renal stones, high risk of fracture, constipation, peptic ulcer, and pancreatitis.^3,7

Continue: In contrast...

In contrast, LAHP is characterized by mild, intermittent, and/or persistent hypercalcemia and mildly increased PTH (Table 1).^1,3,4 In some patients, it could improve without active intervention. Because lithium increases the absorption of urinary calcium, it is associated with hypocalciuria and a lower risk of renal stones. Additionally, lithium has osteoprotective effects and has not been associated with an increased risk of fracture. Some researchers have suggested that the presentation of LAHP is more like familial hypocalciuric hypercalcemia (FHC), which is also associated with hypocalciuria. FHC is a benign condition and does not require active intervention.^3,4 Similar to those with FHC, many patients with LAHP may live with chronic asymptomatic hypercalcemia without any significant adverse outcome.

A suggested approach to monitoring

In most cases, LAH is an insidious adverse effect that is usually detected on blood tests after many years of lithium therapy.⁸ For patients starting lithium therapy, International Society of Bipolar Disorder guidelines recommend testing calcium levels at baseline, 6 months, and annually thereafter, or as clinically indicated, to detect and monitor hypercalcemia and hyperparathyroidism. However, these guidelines do not provide any recommendations regarding how to manage abnormal findings.⁹

Clinical laboratories report both total and adjusted calcium values. The adjusted calcium value takes into account albumin levels. This is a way to compensate for an abnormal concentration of albumin (establishing what a patient’s total calcium concentration would be if the albumin concentration was normal). Table 2⁵ shows the categorization of adjusted calcium values.For patients receiving lithium, some researchers have suggested monitoring PTH as well as calcium.¹

The Figure outlines our proposed approach to monitoring for LAH in patients receiving lithium. An isolated high value of calcium could be due to prolonged venous stasis if a tourniquet is used for phlebotomy. In such instances, the calcium level should be tested again without a tourniquet.¹⁰ If the repeat blood test shows elevated calcium levels, then both PTH and serum calcium should be tested.

If the PTH level is higher than the midpoint of the reference range, LAH should be suspected, though sometimes hypercalcemia can present without raised PTH. LAH has also been reported to cause a transient increase in calcium levels. If hypercalcemia frequently recurs, PTH levels should be monitored. If PTH is suppressed, then the raised calcium levels are probably secondary to something other than lithium; common reasons for this include the use of vitamin D supplements or thiazide diuretics, or malignancies such as multiple myeloma.^3,5,8

Continue to: Treatment

There are several options for treating LAH. Lithium may be continued or discontinued following close monitoring of calcium and PTH levels, with or without active interventions such as surgery or pharmacotherapy, and as deemed appropriate after consultation with an endocrinologist. The decision should be informed by evaluating the risks and benefits to the patient’s physical and mental health. LAH can be reversed by discontinuing lithium, but this might not be the case in patients receiving long-term lithium therapy, especially if their elevated calcium levels are associated with parathyroid adenomas or hyperplasia. Hence, close monitoring of calcium and PTH is required even after discontinuing lithium.^3,8

Surgical treatment. The primary treatment of LAH and primary hyperparathyroidism is parathyroidectomy. The possibility of recovery after parathyroidectomy for primary hyperparathyroidism is 60% to 80%, though a small proportion of patients might experience recurrence. This figure might be higher for LAH, because it is more likely to affect multiple glands.^1,11 Other potential complications of parathyroidectomy are recurrent laryngeal nerve injury causing paralysis of vocal cords leading to hoarseness of voice, stridor, or aspiration, and local hematoma and hypocalcemia (requiring vitamin D and/or calcium supplements).¹²

Pharmacotherapy. Cinacalcet is a calcimimetic drug that decreases the reset point of the calcium-sensing receptor. It can be used if a patient is not suitable for or apprehensive about surgical intervention.^1,8

Bottom Line

Calcium levels should be regularly monitored in patients receiving lithium. If calcium levels are persistently high, parathyroid hormone levels should also be measured. Management of lithium-associated hypercalcemia includes watchful waiting, discontinuing lithium, parathyroidectomy, and pharmacotherapy with cinacalcet.

Related Resources

• Laski M, Foreman R, Hancock H, et al. Lithium: an underutilized element. Current Psychiatry. 2021;20(12):27-30,34. doi:10.12788/cp.0193
• Pelekanos M, Foo K. A resident’s guide to lithium. Current Psychiatry. 2021;20(4):e3-e7. doi:10.12788/cp.0113

Drug Brand Names

Cinacalcet • Sensipar

Hypercalcemia is a well-known but underrecognized adverse effect of lithium. Most patients with lithium-associated hypercalcemia (LAH) have either nonspecific symptoms (eg, persistent tiredness, constipation, polyuria, polydipsia) or no symptoms. Clinically, LAH differs from primary hyperparathyroidism, though the management protocol of these 2 conditions is almost the same. In this article, we discuss how lithium can affect calcium and parathyroid hormone (PTH) levels and how LAH and lithium-associated hyperparathyroidism (LAHP) differs from primary hyperparathyroidism. We also outline a suggested approach to monitoring and management.

An insidious problem

Due to the varying definitions and methods used to assess hypercalcemia, the reported prevalence of LAH varies from 4.3% to 80%.¹ McKnight et al² conducted a systematic review and meta-analysis of studies of the relationship between lithium and parathyroid function that included 14 case-control studies, 36 case reports, and 6 cross-sectional studies without a control group. They found that the levels of calcium and PTH were 10% higher in lithium-treated patients than in controls.²

Pathophysiology. Lithium is known to increase both calcium and PTH levels. PTH is responsible for calcium homeostasis. It is secreted in response to low calcium levels, which it increases by its action on bones, intestines, and kidneys. Vitamin D also plays a crucial role in calcium homeostasis. A deficiency of vitamin D triggers a compensatory increase in PTH to maintain calcium levels.³

Calcium and PTH levels increase soon after administration of lithium, but the rise is usually mild and insidious. In a small proportion of patients who receive long-term lithium treatment, calcium levels can exceed the normal range. Patients who develop LAH typically have serum calcium levels slightly above the normal range and PTH levels ranging from the higher side of the normal range to several times the upper limit of the normal range. Patients might also experience elevated PTH levels without any increase in calcium levels. Lithium can affect calcium and PTH levels in multiple ways. For instance, it increases the reabsorption of calcium in the kidney as well as the reset point of calcium-sensing receptors. Therefore, only higher levels of calcium can inhibit the release of PTH. Hence, in cases where the PTH level is within the normal range, it is generally higher than would be expected for a given serum calcium level. Lithium can also directly affect the parathyroid glands and can lead to either single-nodule or multimodule hyperplasia.⁴

Long-term lithium use can cause chronic kidney disease (CKD), which in turn leads to vitamin D deficiency and hyperparathyroidism. However, secondary hyperparathyroidism with CKD is usually seen in the more advanced stages of CKD, and is associated with low-to-normal calcium levels (as opposed to the high levels seen in LAH).^3-5

Lithium-associated hyperparathyroidism

Primary hyperparathyroidism is the most common cause of hypercalcemia. Its prevalence ranges from 1 to 7 cases per 1,000 adults. The incidence of LAH/LAHP is 4- to 6-fold higher compared to the general population.⁶ Similar to LAH/LAHP, primary hyperparathyroidism is more common in older adults (age >60) and females. Hence, some researchers have suggested that lithium probably unmasks hyperparathyroidism in patients who are susceptible to primary hyperparathyroidism.³

Look for these clinical manifestations

Symptoms of primary hyperparathyroidism are related to high calcium and PTH levels. They are commonly described as “painful bones, renal stones, abdominal groans (due to hypercalcemia-induced ileus), and psychic moans (lethargy, poor concentration, depression).” Common adverse outcomes associated with primary hyperparathyroidism are renal stones, high risk of fracture, constipation, peptic ulcer, and pancreatitis.^3,7

Continue: In contrast...

In contrast, LAHP is characterized by mild, intermittent, and/or persistent hypercalcemia and mildly increased PTH (Table 1).^1,3,4 In some patients, it could improve without active intervention. Because lithium increases the absorption of urinary calcium, it is associated with hypocalciuria and a lower risk of renal stones. Additionally, lithium has osteoprotective effects and has not been associated with an increased risk of fracture. Some researchers have suggested that the presentation of LAHP is more like familial hypocalciuric hypercalcemia (FHC), which is also associated with hypocalciuria. FHC is a benign condition and does not require active intervention.^3,4 Similar to those with FHC, many patients with LAHP may live with chronic asymptomatic hypercalcemia without any significant adverse outcome.

A suggested approach to monitoring

In most cases, LAH is an insidious adverse effect that is usually detected on blood tests after many years of lithium therapy.⁸ For patients starting lithium therapy, International Society of Bipolar Disorder guidelines recommend testing calcium levels at baseline, 6 months, and annually thereafter, or as clinically indicated, to detect and monitor hypercalcemia and hyperparathyroidism. However, these guidelines do not provide any recommendations regarding how to manage abnormal findings.⁹

Clinical laboratories report both total and adjusted calcium values. The adjusted calcium value takes into account albumin levels. This is a way to compensate for an abnormal concentration of albumin (establishing what a patient’s total calcium concentration would be if the albumin concentration was normal). Table 2⁵ shows the categorization of adjusted calcium values.For patients receiving lithium, some researchers have suggested monitoring PTH as well as calcium.¹

The Figure outlines our proposed approach to monitoring for LAH in patients receiving lithium. An isolated high value of calcium could be due to prolonged venous stasis if a tourniquet is used for phlebotomy. In such instances, the calcium level should be tested again without a tourniquet.¹⁰ If the repeat blood test shows elevated calcium levels, then both PTH and serum calcium should be tested.

If the PTH level is higher than the midpoint of the reference range, LAH should be suspected, though sometimes hypercalcemia can present without raised PTH. LAH has also been reported to cause a transient increase in calcium levels. If hypercalcemia frequently recurs, PTH levels should be monitored. If PTH is suppressed, then the raised calcium levels are probably secondary to something other than lithium; common reasons for this include the use of vitamin D supplements or thiazide diuretics, or malignancies such as multiple myeloma.^3,5,8

Continue to: Treatment

There are several options for treating LAH. Lithium may be continued or discontinued following close monitoring of calcium and PTH levels, with or without active interventions such as surgery or pharmacotherapy, and as deemed appropriate after consultation with an endocrinologist. The decision should be informed by evaluating the risks and benefits to the patient’s physical and mental health. LAH can be reversed by discontinuing lithium, but this might not be the case in patients receiving long-term lithium therapy, especially if their elevated calcium levels are associated with parathyroid adenomas or hyperplasia. Hence, close monitoring of calcium and PTH is required even after discontinuing lithium.^3,8

Surgical treatment. The primary treatment of LAH and primary hyperparathyroidism is parathyroidectomy. The possibility of recovery after parathyroidectomy for primary hyperparathyroidism is 60% to 80%, though a small proportion of patients might experience recurrence. This figure might be higher for LAH, because it is more likely to affect multiple glands.^1,11 Other potential complications of parathyroidectomy are recurrent laryngeal nerve injury causing paralysis of vocal cords leading to hoarseness of voice, stridor, or aspiration, and local hematoma and hypocalcemia (requiring vitamin D and/or calcium supplements).¹²

Pharmacotherapy. Cinacalcet is a calcimimetic drug that decreases the reset point of the calcium-sensing receptor. It can be used if a patient is not suitable for or apprehensive about surgical intervention.^1,8

Bottom Line

Calcium levels should be regularly monitored in patients receiving lithium. If calcium levels are persistently high, parathyroid hormone levels should also be measured. Management of lithium-associated hypercalcemia includes watchful waiting, discontinuing lithium, parathyroidectomy, and pharmacotherapy with cinacalcet.

Related Resources

• Laski M, Foreman R, Hancock H, et al. Lithium: an underutilized element. Current Psychiatry. 2021;20(12):27-30,34. doi:10.12788/cp.0193
• Pelekanos M, Foo K. A resident’s guide to lithium. Current Psychiatry. 2021;20(4):e3-e7. doi:10.12788/cp.0113

Drug Brand Names

Cinacalcet • Sensipar

Pharmacotherapy for psychiatric disorders is a mixed blessing. The advent of psychotropic medications since the 1950s (antipsychotics, antidepressants, anxiolytics, mood stabilizers) has revolutionized the treatment of serious psychiatric brain disorders, allowing certain patients to be discharged to the community after a lifetime of institutionalization.

However, like all medications, psychotropic agents are often associated with various potentially intolerable symptoms (Table 1) or safety complications (Table 2) because they interact with every organ in the body besides their intended target, the brain, and its neurochemical circuitry.

Imagine if we could treat our psychiatric patients while bypassing the body and achieve response, remission, and ultimately recovery without any systemic adverse effects. Adherence would dramatically improve, our patients’ quality of life would be enhanced, and the overall effectiveness (defined as the complex package of efficacy, safety, and tolerability) would be superior to current pharmacotherapies. This is important because most psychiatric medications must be taken daily for years, even a lifetime, to avoid a relapse of the illness. Psychiatrists frequently must manage adverse effects or switch the patient to a different medication if a tolerability or safety issue emerges, which is very common in psychiatric practice. A significant part of psychopharmacologic management includes ordering various laboratory tests to monitor adverse reactions in major organs, especially the liver, kidney, and heart. Additionally, psychiatric physicians must be constantly cognizant of medications prescribed by other clinicians for comorbid medical conditions to successfully navigate the turbulent seas of pharmacokinetic interactions.

I am sure you have noticed that whenever you watch a direct-to-consumer commercial for any medication, 90% of the advertisement is a background voice listing the various tolerability and safety complications of the medication as required by the FDA. Interestingly, these ads frequently contain colorful scenery and joyful clips, which I suspect are cleverly designed to distract the audience from focusing on the list of adverse effects.

Benefits of nonpharmacologic treatments

No wonder I am a fan of psychotherapy, a well-established psychiatric treatment modality that completely avoids body tissues. It directly targets the brain without needlessly interacting with any other organ. Psychotherapy’s many benefits (improving insight, enhancing adherence, improving self-esteem, reducing risky behaviors, guiding stress management and coping skills, modifying unhealthy beliefs, and ultimately relieving symptoms such as anxiety and depression) are achieved without any somatic adverse effects! Psychotherapy has also been shown to induce neuroplasticity and reduce inflammatory biomarkers.¹ Unlike FDA-approved medications, psychotherapy does not include a “package insert,” 10 to 20 pages (in small print) that mostly focus on warnings, precautions, and sundry physical adverse effects. Even the dosing of psychotherapy is left entirely up to the treating clinician!

Although I have had many gratifying results with pharmacotherapy in my practice, especially in combination with psychotherapy,² I also have observed excellent outcomes with nonpharmacologic approaches, especially neuromodulation therapies. The best antidepressant I have ever used since my residency training days is electroconvulsive therapy (ECT). My experience is consistent with a large meta-analysis³showing a huge effect size (Cohen d = .91) in contrast to the usual effect size of .3 to .5 for standard antidepressants (except IV ketamine). A recent study showed ECT is even better than the vaunted rapid-acting ketamine,⁴ which is further evidence of its remarkable efficacy in depression. Neuroimaging studies report that ECT rapidly increases the volume of the hippocampus,^5,6 which shrinks in size in patients with unipolar or bipolar depression.

Neuromodulation may very well be the future of psychiatric therapeutics. It targets the brain and avoids the body, thus achieving efficacy with minimal systemic tolerability (ie, patient complaints) (Table 1) or safety (abnormal laboratory test results) issues (Table 2). This sounds ideal, and it is arguably an optimal approach to repairing the brain and healing the mind.

Continue to: ECT is the oldest...

ECT is the oldest neuromodulation technique (developed almost 100 years ago and significantly refined since then). Newer FDA-approved neuromodulation therapies include repetitive transcranial magnetic stimulation (rTMS), which was approved for depression in 2013, obsessive-compulsive disorder (OCD) in 2018, smoking cessation in 2020, and anxious depression in 2021.⁷ Vagus nerve stimulation (VNS) is used for drug-resistant epilepsy and was later approved for treatment-resistant depression,^8,9 but some studies report it can be helpful for fear and anxiety in autism spectrum disorder¹⁰ and primary insomnia.¹¹

There are many other neuromodulation therapies in development¹² that have not yet been FDA approved (Table 3). The most prominent of these is deep brain stimulation (DBS), which is approved for Parkinson disease and has been reported in many studies to improve treatment-resistant depression^13,14 and OCD.¹⁵ Another promising neuromodulation therapy is transcranial direct current stimulation (tDCS), which has promising results in schizophrenia¹⁶ similar to ECT’s effects in treatment-resistant schizophrenia.¹⁷

A particularly exciting neuromodulation approach published by Stanford University researchers is Stanford accelerated intelligent neuromodulation therapy (SAINT),¹⁸ which uses intermittent theta-burst stimulation (iTBS) daily for 5 days, targeted at the subgenual anterior cingulate gyrus (Brodman area 25). Remarkably, efficacy was rapid, with a very high remission rate (absence of symptoms) in approximately 90% of patients with severe depression.¹⁸

The future is bright for neuromodulation therapies, and for a good reason. Why send a chemical agent to every cell and organ in the body when the brain can be targeted directly? As psychiatric neuroscience advances to a point where we can localize the abnormal neurologic circuit in a specific brain region for each psychiatric disorder, it will be possible to treat almost all psychiatric disorders without burdening patients with the intolerable symptoms or safety adverse effects of medications. Psychiatrists should modulate their perspective about the future of psychiatric treatments. And finally, I propose that psychotherapy should be reclassified as a “verbal neuromodulation” technique.

Pharmacotherapy for psychiatric disorders is a mixed blessing. The advent of psychotropic medications since the 1950s (antipsychotics, antidepressants, anxiolytics, mood stabilizers) has revolutionized the treatment of serious psychiatric brain disorders, allowing certain patients to be discharged to the community after a lifetime of institutionalization.

However, like all medications, psychotropic agents are often associated with various potentially intolerable symptoms (Table 1) or safety complications (Table 2) because they interact with every organ in the body besides their intended target, the brain, and its neurochemical circuitry.

Imagine if we could treat our psychiatric patients while bypassing the body and achieve response, remission, and ultimately recovery without any systemic adverse effects. Adherence would dramatically improve, our patients’ quality of life would be enhanced, and the overall effectiveness (defined as the complex package of efficacy, safety, and tolerability) would be superior to current pharmacotherapies. This is important because most psychiatric medications must be taken daily for years, even a lifetime, to avoid a relapse of the illness. Psychiatrists frequently must manage adverse effects or switch the patient to a different medication if a tolerability or safety issue emerges, which is very common in psychiatric practice. A significant part of psychopharmacologic management includes ordering various laboratory tests to monitor adverse reactions in major organs, especially the liver, kidney, and heart. Additionally, psychiatric physicians must be constantly cognizant of medications prescribed by other clinicians for comorbid medical conditions to successfully navigate the turbulent seas of pharmacokinetic interactions.

I am sure you have noticed that whenever you watch a direct-to-consumer commercial for any medication, 90% of the advertisement is a background voice listing the various tolerability and safety complications of the medication as required by the FDA. Interestingly, these ads frequently contain colorful scenery and joyful clips, which I suspect are cleverly designed to distract the audience from focusing on the list of adverse effects.

Benefits of nonpharmacologic treatments

No wonder I am a fan of psychotherapy, a well-established psychiatric treatment modality that completely avoids body tissues. It directly targets the brain without needlessly interacting with any other organ. Psychotherapy’s many benefits (improving insight, enhancing adherence, improving self-esteem, reducing risky behaviors, guiding stress management and coping skills, modifying unhealthy beliefs, and ultimately relieving symptoms such as anxiety and depression) are achieved without any somatic adverse effects! Psychotherapy has also been shown to induce neuroplasticity and reduce inflammatory biomarkers.¹ Unlike FDA-approved medications, psychotherapy does not include a “package insert,” 10 to 20 pages (in small print) that mostly focus on warnings, precautions, and sundry physical adverse effects. Even the dosing of psychotherapy is left entirely up to the treating clinician!

Although I have had many gratifying results with pharmacotherapy in my practice, especially in combination with psychotherapy,² I also have observed excellent outcomes with nonpharmacologic approaches, especially neuromodulation therapies. The best antidepressant I have ever used since my residency training days is electroconvulsive therapy (ECT). My experience is consistent with a large meta-analysis³showing a huge effect size (Cohen d = .91) in contrast to the usual effect size of .3 to .5 for standard antidepressants (except IV ketamine). A recent study showed ECT is even better than the vaunted rapid-acting ketamine,⁴ which is further evidence of its remarkable efficacy in depression. Neuroimaging studies report that ECT rapidly increases the volume of the hippocampus,^5,6 which shrinks in size in patients with unipolar or bipolar depression.

Neuromodulation may very well be the future of psychiatric therapeutics. It targets the brain and avoids the body, thus achieving efficacy with minimal systemic tolerability (ie, patient complaints) (Table 1) or safety (abnormal laboratory test results) issues (Table 2). This sounds ideal, and it is arguably an optimal approach to repairing the brain and healing the mind.

Continue to: ECT is the oldest...

ECT is the oldest neuromodulation technique (developed almost 100 years ago and significantly refined since then). Newer FDA-approved neuromodulation therapies include repetitive transcranial magnetic stimulation (rTMS), which was approved for depression in 2013, obsessive-compulsive disorder (OCD) in 2018, smoking cessation in 2020, and anxious depression in 2021.⁷ Vagus nerve stimulation (VNS) is used for drug-resistant epilepsy and was later approved for treatment-resistant depression,^8,9 but some studies report it can be helpful for fear and anxiety in autism spectrum disorder¹⁰ and primary insomnia.¹¹

There are many other neuromodulation therapies in development¹² that have not yet been FDA approved (Table 3). The most prominent of these is deep brain stimulation (DBS), which is approved for Parkinson disease and has been reported in many studies to improve treatment-resistant depression^13,14 and OCD.¹⁵ Another promising neuromodulation therapy is transcranial direct current stimulation (tDCS), which has promising results in schizophrenia¹⁶ similar to ECT’s effects in treatment-resistant schizophrenia.¹⁷

A particularly exciting neuromodulation approach published by Stanford University researchers is Stanford accelerated intelligent neuromodulation therapy (SAINT),¹⁸ which uses intermittent theta-burst stimulation (iTBS) daily for 5 days, targeted at the subgenual anterior cingulate gyrus (Brodman area 25). Remarkably, efficacy was rapid, with a very high remission rate (absence of symptoms) in approximately 90% of patients with severe depression.¹⁸

The future is bright for neuromodulation therapies, and for a good reason. Why send a chemical agent to every cell and organ in the body when the brain can be targeted directly? As psychiatric neuroscience advances to a point where we can localize the abnormal neurologic circuit in a specific brain region for each psychiatric disorder, it will be possible to treat almost all psychiatric disorders without burdening patients with the intolerable symptoms or safety adverse effects of medications. Psychiatrists should modulate their perspective about the future of psychiatric treatments. And finally, I propose that psychotherapy should be reclassified as a “verbal neuromodulation” technique.

Pharmacotherapy for psychiatric disorders is a mixed blessing. The advent of psychotropic medications since the 1950s (antipsychotics, antidepressants, anxiolytics, mood stabilizers) has revolutionized the treatment of serious psychiatric brain disorders, allowing certain patients to be discharged to the community after a lifetime of institutionalization.

However, like all medications, psychotropic agents are often associated with various potentially intolerable symptoms (Table 1) or safety complications (Table 2) because they interact with every organ in the body besides their intended target, the brain, and its neurochemical circuitry.

Imagine if we could treat our psychiatric patients while bypassing the body and achieve response, remission, and ultimately recovery without any systemic adverse effects. Adherence would dramatically improve, our patients’ quality of life would be enhanced, and the overall effectiveness (defined as the complex package of efficacy, safety, and tolerability) would be superior to current pharmacotherapies. This is important because most psychiatric medications must be taken daily for years, even a lifetime, to avoid a relapse of the illness. Psychiatrists frequently must manage adverse effects or switch the patient to a different medication if a tolerability or safety issue emerges, which is very common in psychiatric practice. A significant part of psychopharmacologic management includes ordering various laboratory tests to monitor adverse reactions in major organs, especially the liver, kidney, and heart. Additionally, psychiatric physicians must be constantly cognizant of medications prescribed by other clinicians for comorbid medical conditions to successfully navigate the turbulent seas of pharmacokinetic interactions.

I am sure you have noticed that whenever you watch a direct-to-consumer commercial for any medication, 90% of the advertisement is a background voice listing the various tolerability and safety complications of the medication as required by the FDA. Interestingly, these ads frequently contain colorful scenery and joyful clips, which I suspect are cleverly designed to distract the audience from focusing on the list of adverse effects.

Benefits of nonpharmacologic treatments

No wonder I am a fan of psychotherapy, a well-established psychiatric treatment modality that completely avoids body tissues. It directly targets the brain without needlessly interacting with any other organ. Psychotherapy’s many benefits (improving insight, enhancing adherence, improving self-esteem, reducing risky behaviors, guiding stress management and coping skills, modifying unhealthy beliefs, and ultimately relieving symptoms such as anxiety and depression) are achieved without any somatic adverse effects! Psychotherapy has also been shown to induce neuroplasticity and reduce inflammatory biomarkers.¹ Unlike FDA-approved medications, psychotherapy does not include a “package insert,” 10 to 20 pages (in small print) that mostly focus on warnings, precautions, and sundry physical adverse effects. Even the dosing of psychotherapy is left entirely up to the treating clinician!

Although I have had many gratifying results with pharmacotherapy in my practice, especially in combination with psychotherapy,² I also have observed excellent outcomes with nonpharmacologic approaches, especially neuromodulation therapies. The best antidepressant I have ever used since my residency training days is electroconvulsive therapy (ECT). My experience is consistent with a large meta-analysis³showing a huge effect size (Cohen d = .91) in contrast to the usual effect size of .3 to .5 for standard antidepressants (except IV ketamine). A recent study showed ECT is even better than the vaunted rapid-acting ketamine,⁴ which is further evidence of its remarkable efficacy in depression. Neuroimaging studies report that ECT rapidly increases the volume of the hippocampus,^5,6 which shrinks in size in patients with unipolar or bipolar depression.

Neuromodulation may very well be the future of psychiatric therapeutics. It targets the brain and avoids the body, thus achieving efficacy with minimal systemic tolerability (ie, patient complaints) (Table 1) or safety (abnormal laboratory test results) issues (Table 2). This sounds ideal, and it is arguably an optimal approach to repairing the brain and healing the mind.

Continue to: ECT is the oldest...

ECT is the oldest neuromodulation technique (developed almost 100 years ago and significantly refined since then). Newer FDA-approved neuromodulation therapies include repetitive transcranial magnetic stimulation (rTMS), which was approved for depression in 2013, obsessive-compulsive disorder (OCD) in 2018, smoking cessation in 2020, and anxious depression in 2021.⁷ Vagus nerve stimulation (VNS) is used for drug-resistant epilepsy and was later approved for treatment-resistant depression,^8,9 but some studies report it can be helpful for fear and anxiety in autism spectrum disorder¹⁰ and primary insomnia.¹¹

There are many other neuromodulation therapies in development¹² that have not yet been FDA approved (Table 3). The most prominent of these is deep brain stimulation (DBS), which is approved for Parkinson disease and has been reported in many studies to improve treatment-resistant depression^13,14 and OCD.¹⁵ Another promising neuromodulation therapy is transcranial direct current stimulation (tDCS), which has promising results in schizophrenia¹⁶ similar to ECT’s effects in treatment-resistant schizophrenia.¹⁷

A particularly exciting neuromodulation approach published by Stanford University researchers is Stanford accelerated intelligent neuromodulation therapy (SAINT),¹⁸ which uses intermittent theta-burst stimulation (iTBS) daily for 5 days, targeted at the subgenual anterior cingulate gyrus (Brodman area 25). Remarkably, efficacy was rapid, with a very high remission rate (absence of symptoms) in approximately 90% of patients with severe depression.¹⁸

The future is bright for neuromodulation therapies, and for a good reason. Why send a chemical agent to every cell and organ in the body when the brain can be targeted directly? As psychiatric neuroscience advances to a point where we can localize the abnormal neurologic circuit in a specific brain region for each psychiatric disorder, it will be possible to treat almost all psychiatric disorders without burdening patients with the intolerable symptoms or safety adverse effects of medications. Psychiatrists should modulate their perspective about the future of psychiatric treatments. And finally, I propose that psychotherapy should be reclassified as a “verbal neuromodulation” technique.

As leaders of the American Psychiatric Association, we received dozens of communications from members who were shocked by the discriminatory and transphobic commentary in the recent editorial “The accelerating societal entropy undermines mental health” (Current Psychiatry, October 2022, p. 7-8, 27, doi:10.12788/cp.0295). Many of the items on the list Dr. Nasrallah cited as “indicators” of chaos in society are ill-informed and harmful. The attack on gender nonbinary and transgender people, including children, perpetuates stigmatization of, and ongoing harm to, already vulnerable people.

Specifically, citing “lack of certainty about gender identity in children and adults” as an indicator of societal turmoil that undermines mental health is contrary to the scientific understanding of gender identity. Physicians have professional obligations to advance patients’ well-being and do no harm.

The medical profession, including psychiatry, is at a critical juncture in coming to terms with and dismantling its longstanding history of systemic racism and discrimination. Authors and editors must be aware that harmful and divisive language negatively affects mental health, especially for people who have been subject to discrimination individually and/or as members of historically excluded and/or minoritized groups.

In publishing this editorial, Current Psychiatry failed in its mission to enhance patient care and advance personal development for clinicians. An apology and retraction are in order.

Rebecca W. Brendel, MD, JD, DFAPA

President

American Psychiatric Association

Saul Levin, MD, MPA, FRCP-E, FRCPsych

CEO and Medical Director

American Psychiatric Association

Disclosures

The authors report no financial relationships with any companies whose products are mentioned in this letter, or with manufacturers of competing products.

Dr. Nasrallah responds

I regret that the sentence about gender identity in my October editorial was regarded as transphobic and harmful. While the phrasing reflected my patients’ comments to me, I realize my unfortunate choice of words deeply offended individuals who are transgender, who have been subjected to ongoing discrimination and prejudice.

I apologize to our readers; to my American Psychiatric Association LGBTQAI+ friends, colleagues, and relatives; and to the LGBTQAI+ community at large. The sentence has been deleted from the online version of my editorial. This has been a teachable moment for me.

Current Psychiatry has long supported LGBTQAI+ individuals and provided education for clinicians about issues related to gender and sexuality. Most recently, we published “A gender primer for psychiatrists” (Current Psychiatry, November 2022, p. 32-33, doi:10.12788/cp.0306). We are also working on an article for publication in a future issue about providing gender-affirming care for individuals who are gender nonbinary or transgender.

Henry A. Nasrallah, MD

Editor-In-Chief

Continue to: More on psychiatric documentation

Dr. Joshi’s helpful discussion of clinical documentation strategies (“Medical record documentation: What to do, and what to avoid,” Current Psychiatry, October 2022, p. 46, 48, doi:10.12788/cp.0292) incisively frames the medical record as a multiuse tool for both ensuring continuity of care for the patient and demonstrating adherence to the standard of care by the clinician. In a similar vein, I hope the following general medicolegal observations may prove useful to busy psychiatric practitioners.

The mental health record may not always be as confidential as psychiatrists think (or hope) it is. The Health Insurance Portability and Accountability Act (HIPAA) Privacy Rule, for example, generally does not distinguish between medical and mental health information, nor does it provide special rules for the latter (although certain state laws may do so). HIPAA provides added protections for “psychotherapy notes,” but this category explicitly excludes progress notes that discuss treatment modalities, diagnosis, and clinical milestones. To retain their protected status, psychotherapists’ private, “desk-drawer memory joggers” must never be comingled with the patient chart.¹ For mental health professionals, this distinction underscores the importance of keeping personal details broad in the progress note; scandalous or embarrassing narratives recounted in the medical record itself are routinely accessible to the patient and may be lawfully disclosed to others under specified circumstances.

In addition to avoiding speculation and including patient quotes when appropriate, documenting objectively and nonjudgmentally means annotating facts and observations that helped the clinician arrive at their conclusion. For example, “patient appears intoxicated” is less helpful than noting the patient’s slurred speech, impaired gait and/or coordination, and alcohol odor.

Clinical care and its associated documentation are so intertwined that they can become virtually indistinguishable. In a medical malpractice case, the burden is on the plaintiff to prove their injury resulted from substandard care. Some courts, however, have held that missing or incomplete records can effectively shift the burden from the recipient to the provider of care to show that the treatment at issue was rendered non-negligently.² Statutes of limitations restricting the amount of time in which a patient can sue after an adverse event are sometimes triggered by the date on which they knew or should have known of the alleged malpractice.³ One of the best ways of ascertaining this date, and starting the statute of limitations clock, can be a clear annotation in the medical record that the patient was apprised of an unanticipated outcome or iatrogenic harm. In this way, a timely and thorough note can be critical not just to defending the physician’s quality of care, but potentially to precluding a cognizable lawsuit altogether.

Charles G. Kels, JD

Defense Health Agency

San Antonio, Texas

Disclosures

The views expressed are those of the author and do not necessarily reflect those of any government agency, nor do they constitute individualized legal advice. The author reports no financial relationships with any companies whose products are mentioned in this letter, or with manufacturers of competing products.

References

1. 45 CFR Parts 160 and 164, Subparts A and E.

2. Valcin v Public Health Trust, 473 So. 2d 1297 (1984).

3. US v Kubrick, 444 US 111 (1979).

As leaders of the American Psychiatric Association, we received dozens of communications from members who were shocked by the discriminatory and transphobic commentary in the recent editorial “The accelerating societal entropy undermines mental health” (Current Psychiatry, October 2022, p. 7-8, 27, doi:10.12788/cp.0295). Many of the items on the list Dr. Nasrallah cited as “indicators” of chaos in society are ill-informed and harmful. The attack on gender nonbinary and transgender people, including children, perpetuates stigmatization of, and ongoing harm to, already vulnerable people.

Specifically, citing “lack of certainty about gender identity in children and adults” as an indicator of societal turmoil that undermines mental health is contrary to the scientific understanding of gender identity. Physicians have professional obligations to advance patients’ well-being and do no harm.

The medical profession, including psychiatry, is at a critical juncture in coming to terms with and dismantling its longstanding history of systemic racism and discrimination. Authors and editors must be aware that harmful and divisive language negatively affects mental health, especially for people who have been subject to discrimination individually and/or as members of historically excluded and/or minoritized groups.

In publishing this editorial, Current Psychiatry failed in its mission to enhance patient care and advance personal development for clinicians. An apology and retraction are in order.

Rebecca W. Brendel, MD, JD, DFAPA

President

American Psychiatric Association

Saul Levin, MD, MPA, FRCP-E, FRCPsych

CEO and Medical Director

American Psychiatric Association

Disclosures

The authors report no financial relationships with any companies whose products are mentioned in this letter, or with manufacturers of competing products.

Dr. Nasrallah responds

I regret that the sentence about gender identity in my October editorial was regarded as transphobic and harmful. While the phrasing reflected my patients’ comments to me, I realize my unfortunate choice of words deeply offended individuals who are transgender, who have been subjected to ongoing discrimination and prejudice.

I apologize to our readers; to my American Psychiatric Association LGBTQAI+ friends, colleagues, and relatives; and to the LGBTQAI+ community at large. The sentence has been deleted from the online version of my editorial. This has been a teachable moment for me.

Current Psychiatry has long supported LGBTQAI+ individuals and provided education for clinicians about issues related to gender and sexuality. Most recently, we published “A gender primer for psychiatrists” (Current Psychiatry, November 2022, p. 32-33, doi:10.12788/cp.0306). We are also working on an article for publication in a future issue about providing gender-affirming care for individuals who are gender nonbinary or transgender.

Henry A. Nasrallah, MD

Editor-In-Chief

Continue to: More on psychiatric documentation

Dr. Joshi’s helpful discussion of clinical documentation strategies (“Medical record documentation: What to do, and what to avoid,” Current Psychiatry, October 2022, p. 46, 48, doi:10.12788/cp.0292) incisively frames the medical record as a multiuse tool for both ensuring continuity of care for the patient and demonstrating adherence to the standard of care by the clinician. In a similar vein, I hope the following general medicolegal observations may prove useful to busy psychiatric practitioners.

The mental health record may not always be as confidential as psychiatrists think (or hope) it is. The Health Insurance Portability and Accountability Act (HIPAA) Privacy Rule, for example, generally does not distinguish between medical and mental health information, nor does it provide special rules for the latter (although certain state laws may do so). HIPAA provides added protections for “psychotherapy notes,” but this category explicitly excludes progress notes that discuss treatment modalities, diagnosis, and clinical milestones. To retain their protected status, psychotherapists’ private, “desk-drawer memory joggers” must never be comingled with the patient chart.¹ For mental health professionals, this distinction underscores the importance of keeping personal details broad in the progress note; scandalous or embarrassing narratives recounted in the medical record itself are routinely accessible to the patient and may be lawfully disclosed to others under specified circumstances.

In addition to avoiding speculation and including patient quotes when appropriate, documenting objectively and nonjudgmentally means annotating facts and observations that helped the clinician arrive at their conclusion. For example, “patient appears intoxicated” is less helpful than noting the patient’s slurred speech, impaired gait and/or coordination, and alcohol odor.

Clinical care and its associated documentation are so intertwined that they can become virtually indistinguishable. In a medical malpractice case, the burden is on the plaintiff to prove their injury resulted from substandard care. Some courts, however, have held that missing or incomplete records can effectively shift the burden from the recipient to the provider of care to show that the treatment at issue was rendered non-negligently.² Statutes of limitations restricting the amount of time in which a patient can sue after an adverse event are sometimes triggered by the date on which they knew or should have known of the alleged malpractice.³ One of the best ways of ascertaining this date, and starting the statute of limitations clock, can be a clear annotation in the medical record that the patient was apprised of an unanticipated outcome or iatrogenic harm. In this way, a timely and thorough note can be critical not just to defending the physician’s quality of care, but potentially to precluding a cognizable lawsuit altogether.

Charles G. Kels, JD

Defense Health Agency

San Antonio, Texas

Disclosures

The views expressed are those of the author and do not necessarily reflect those of any government agency, nor do they constitute individualized legal advice. The author reports no financial relationships with any companies whose products are mentioned in this letter, or with manufacturers of competing products.

References

1. 45 CFR Parts 160 and 164, Subparts A and E.

2. Valcin v Public Health Trust, 473 So. 2d 1297 (1984).

3. US v Kubrick, 444 US 111 (1979).

As leaders of the American Psychiatric Association, we received dozens of communications from members who were shocked by the discriminatory and transphobic commentary in the recent editorial “The accelerating societal entropy undermines mental health” (Current Psychiatry, October 2022, p. 7-8, 27, doi:10.12788/cp.0295). Many of the items on the list Dr. Nasrallah cited as “indicators” of chaos in society are ill-informed and harmful. The attack on gender nonbinary and transgender people, including children, perpetuates stigmatization of, and ongoing harm to, already vulnerable people.

Specifically, citing “lack of certainty about gender identity in children and adults” as an indicator of societal turmoil that undermines mental health is contrary to the scientific understanding of gender identity. Physicians have professional obligations to advance patients’ well-being and do no harm.

The medical profession, including psychiatry, is at a critical juncture in coming to terms with and dismantling its longstanding history of systemic racism and discrimination. Authors and editors must be aware that harmful and divisive language negatively affects mental health, especially for people who have been subject to discrimination individually and/or as members of historically excluded and/or minoritized groups.

In publishing this editorial, Current Psychiatry failed in its mission to enhance patient care and advance personal development for clinicians. An apology and retraction are in order.

Rebecca W. Brendel, MD, JD, DFAPA

President

American Psychiatric Association

Saul Levin, MD, MPA, FRCP-E, FRCPsych

CEO and Medical Director

American Psychiatric Association

Disclosures

The authors report no financial relationships with any companies whose products are mentioned in this letter, or with manufacturers of competing products.

Dr. Nasrallah responds

I regret that the sentence about gender identity in my October editorial was regarded as transphobic and harmful. While the phrasing reflected my patients’ comments to me, I realize my unfortunate choice of words deeply offended individuals who are transgender, who have been subjected to ongoing discrimination and prejudice.

I apologize to our readers; to my American Psychiatric Association LGBTQAI+ friends, colleagues, and relatives; and to the LGBTQAI+ community at large. The sentence has been deleted from the online version of my editorial. This has been a teachable moment for me.

Current Psychiatry has long supported LGBTQAI+ individuals and provided education for clinicians about issues related to gender and sexuality. Most recently, we published “A gender primer for psychiatrists” (Current Psychiatry, November 2022, p. 32-33, doi:10.12788/cp.0306). We are also working on an article for publication in a future issue about providing gender-affirming care for individuals who are gender nonbinary or transgender.

Henry A. Nasrallah, MD

Editor-In-Chief

Continue to: More on psychiatric documentation

Dr. Joshi’s helpful discussion of clinical documentation strategies (“Medical record documentation: What to do, and what to avoid,” Current Psychiatry, October 2022, p. 46, 48, doi:10.12788/cp.0292) incisively frames the medical record as a multiuse tool for both ensuring continuity of care for the patient and demonstrating adherence to the standard of care by the clinician. In a similar vein, I hope the following general medicolegal observations may prove useful to busy psychiatric practitioners.

The mental health record may not always be as confidential as psychiatrists think (or hope) it is. The Health Insurance Portability and Accountability Act (HIPAA) Privacy Rule, for example, generally does not distinguish between medical and mental health information, nor does it provide special rules for the latter (although certain state laws may do so). HIPAA provides added protections for “psychotherapy notes,” but this category explicitly excludes progress notes that discuss treatment modalities, diagnosis, and clinical milestones. To retain their protected status, psychotherapists’ private, “desk-drawer memory joggers” must never be comingled with the patient chart.¹ For mental health professionals, this distinction underscores the importance of keeping personal details broad in the progress note; scandalous or embarrassing narratives recounted in the medical record itself are routinely accessible to the patient and may be lawfully disclosed to others under specified circumstances.

In addition to avoiding speculation and including patient quotes when appropriate, documenting objectively and nonjudgmentally means annotating facts and observations that helped the clinician arrive at their conclusion. For example, “patient appears intoxicated” is less helpful than noting the patient’s slurred speech, impaired gait and/or coordination, and alcohol odor.

Clinical care and its associated documentation are so intertwined that they can become virtually indistinguishable. In a medical malpractice case, the burden is on the plaintiff to prove their injury resulted from substandard care. Some courts, however, have held that missing or incomplete records can effectively shift the burden from the recipient to the provider of care to show that the treatment at issue was rendered non-negligently.² Statutes of limitations restricting the amount of time in which a patient can sue after an adverse event are sometimes triggered by the date on which they knew or should have known of the alleged malpractice.³ One of the best ways of ascertaining this date, and starting the statute of limitations clock, can be a clear annotation in the medical record that the patient was apprised of an unanticipated outcome or iatrogenic harm. In this way, a timely and thorough note can be critical not just to defending the physician’s quality of care, but potentially to precluding a cognizable lawsuit altogether.

Charles G. Kels, JD

Defense Health Agency

San Antonio, Texas

Disclosures

The views expressed are those of the author and do not necessarily reflect those of any government agency, nor do they constitute individualized legal advice. The author reports no financial relationships with any companies whose products are mentioned in this letter, or with manufacturers of competing products.

References

1. 45 CFR Parts 160 and 164, Subparts A and E.

2. Valcin v Public Health Trust, 473 So. 2d 1297 (1984).

3. US v Kubrick, 444 US 111 (1979).

Mr. M, age 46, has opioid use disorder (OUD). He is currently stabilized on methadone 80 mg/d but presents to your hospital with uncontrolled atrial fibrillation. After Mr. M is admitted, the care team looks to start amiodarone; however, they receive notice of a drug-drug interaction that may cause QTc prolongation. Mr. M agrees to switch to another medication to treat his OUD because he is tired of the regulated process required to receive methadone. The care team would like to taper him to a different OUD medication but would like Mr. M to avoid cravings, symptoms of withdrawal, and potential relapse.

The opioid epidemic has devastated the United States, causing approximately 130 deaths per day.¹ The economic burden of this epidemic on medical, social welfare, and correctional services is approximately $1 trillion annually.² Research supports opioid replacement therapy for treating OUD.¹ Multiple types of opioid replacement therapies are available in multiple dosage forms; all act on the mu-opioid receptor. These include full agonist treatment (eg, methadone) and partial agonist treatment (eg, buprenorphine).³ Alternatively, opioid antagonist therapies (eg, naltrexone) have also been found to be effective for treating OUD.^1,2,4 This article focuses on partial agonist treatment for OUD, specifically using a buprenorphine microdosing strategy to transition a patient from methadone to buprenorphine.

Buprenorphine for OUD

Buprenorphine binds with high affinity to the mu-opioid receptor, resulting in partial agonism of the receptor.^1,2 Buprenorphine has a higher therapeutic index and lower intrinsic agonist activity than other opioids and a low incidence of adverse effects. Due to the partial agonism at the mu receptor, its analgesic effects plateau at higher doses and exhibit antagonist properties.^1,2 This distinct “ceiling” effect, combined with a lower risk of respiratory depression, makes buprenorphine significantly safer than methadone.⁴ Additionally, it has a lower potential for misuse when used with an abuse deterrent such as naloxone.

Common reasons for transitioning a patient from methadone to buprenorphine include intolerable adverse effects of methadone, variable duration of efficacy, drug-drug interactions, or limited access to an opioid treatment program. Traditional buprenorphine induction requires moderate withdrawal before initiating therapy. Due to buprenorphine’s high affinity and partial agonism at the mu receptor, it competes with other opioids (eg, heroin, methadone) and will abruptly displace the receptor’s full agonist with a lower affinity, resulting in precipitated withdrawal.^1,3,5 To avoid precipitated withdrawal, it is recommended to leave a sufficient amount of time between full opioid agonist treatment and buprenorphine treatment, a process called “opioid washout.”^1,5 Depending on the duration, amount, and specific opioid used, the amount of time between ending opioid agonist treatment and initiating buprenorphine treatment may vary. As a result, many patients who attempt to transition from methadone to buprenorphine remain on methadone due to their inability to tolerate withdrawal. Additionally, given the risk of precipitating withdrawal, initiating buprenorphine may negatively impact pain control.¹

Recently, buprenorphine “microdosing” inductions, which do not require patients to be in opioid withdrawal, have been used to overcome some of the challenges of transitioning patients from methadone to buprenorphine.²

Buprenorphine microdosing techniques

Multiple methods of microdosing buprenorphine have been used in both inpatient and outpatient settings.

Bernese method. In 1997, Mendelson et al⁶ completed a trial with 5 patients maintained on methadone. They found that IV buprenorphine 0.2 mg every 24 hours did not produce a withdrawal effect and was comparable to placebo.⁶ Haamig et al⁵ hypothesized that repetitive administration of buprenorphine at minute doses in adequate dosing intervals would not cause withdrawal. Additionally, because of its high receptor binding affinity, buprenorphine will accumulate over time at the mu receptor. Thus, eventually the full mu agonist (eg, methadone) will be replaced by buprenorphine at the mu receptor as the receptor becomes saturated.^4,5

Continue to: The goal is to taper...

The goal is to taper the opioid agonist therapy while titrating buprenorphine. This taper method is not described in current treatment guidelines, and as a result, there are differences in doses used in each taper because the amount of opioid agonist and type of opioid agonist therapy can vary. In most cases, buprenorphine is initiated at 0.25 mg/d to 0.5 mg/d and increased by 0.25 mg/d to 1 mg/d as tolerated.^4,5 The dose of the full opioid agonist is slowly decreased as the buprenorphine dose increases. The Bernese method does not require frequent dosing, so it is a favorable option for outpatient therapy.⁴ One limitation to this method is that it is necessary to divide tablets into small doses.⁴ Additionally, adherence issues may disrupt the tapering method; therefore, some patients may not be appropriate candidates.⁴

Transdermal patch method. This method aims to provide a consistent amount of buprenorphine—similar to dividing tablets into smaller doses as seen in the Bernese method—but with the goal of avoiding inconsistencies in dosing. Hess et al⁷ examined 22 patients with OUD who were maintained on methadone 60 mg/d to 100 mg/d. In the buprenorphine transdermal patch method, a 35 mcg/h buprenorphine patch was applied 12 hours after the patient’s final methadone dose.^1,7 This was intended to provide continuous delivery over 96 hours.¹ Additionally, small, incremental doses of sublingual buprenorphine (SL-BUP) were administered throughout the course of 5 days.¹ A potential strength of this method is that like the Bernese method, it may be completed in outpatient therapy.⁴ Potential limitations include time to initiation, off-label use, and related costs.

Rapid microdosing induction method. Contrary to typical microdosing, rapid microdosing induction requires buprenorphine to be administered every 3 to 4 hours.⁴ As with most buprenorphine microinduction protocols, this does not require a period of withdrawal prior to initiation and may be performed because of the 1-hour time to peak effect of buprenorphine.⁴ Due to the frequent dosing schedule, it is recommended to use this method in an inpatient setting.⁴ With rapid microdosing, an individual may receive SL-BUP 0.5 mg every 3 hours on Day 1, then 1 mg SL-BUP every 3 hours on Day 2. On Day 3, the individual may receive 12 mg SL-BUP with 2 mg as needed. A limitation of this method is that it must be performed in an inpatient setting.⁴

CASE CONTINUED

To ensure patient-inclusive care, clinicians should conduct a risk-benefit discussion with the patient regarding microdosing buprenorphine. Because Mr. M would like to be managed as an outpatient, rapid microdosing is not an option. Mr. M works with his care team to design a microdosing approach with the Bernese method. They initiate buprenorphine 0.5 mg/d and increase the dose by 0.5 mg to 1 mg from Day 2 to Day 8. The variance in buprenorphine titration occurs due to Mr. M’s tolerance and symptoms of withdrawal. The team decreases the methadone dose by 5 mg to 10 mg each day, depending on symptoms of withdrawal, and discontinues therapy on Day 8. Throughout the microdosing induction, Mr. M does not experience withdrawal symptoms and is now managed on buprenorphine 12 mg/d.

Related Resources

• Van Hale C, Gluck R, Tang Y. Laboratory monitoring for patients on buprenorphine: 10 questions. Current Psychiatry. 2022;21(9):12-15,20-21,26.
• Moreno JL, Johnson JL, Peckham AM. Sublingual buprenorphine plus buprenorphine XR for opioid use disorder. Current Psychiatry. 2022;21(6):39-42,49.

Drug Brand Names

Amiodarone • Cordarone
Buprenorphine • Subutex, Sublocade
Buprenorphine/naloxone • Suboxone, Zubsolv
Methadone • Dolophine, Methadose
Naltrexone • ReVia, Vivitrol

Mr. M, age 46, has opioid use disorder (OUD). He is currently stabilized on methadone 80 mg/d but presents to your hospital with uncontrolled atrial fibrillation. After Mr. M is admitted, the care team looks to start amiodarone; however, they receive notice of a drug-drug interaction that may cause QTc prolongation. Mr. M agrees to switch to another medication to treat his OUD because he is tired of the regulated process required to receive methadone. The care team would like to taper him to a different OUD medication but would like Mr. M to avoid cravings, symptoms of withdrawal, and potential relapse.

The opioid epidemic has devastated the United States, causing approximately 130 deaths per day.¹ The economic burden of this epidemic on medical, social welfare, and correctional services is approximately $1 trillion annually.² Research supports opioid replacement therapy for treating OUD.¹ Multiple types of opioid replacement therapies are available in multiple dosage forms; all act on the mu-opioid receptor. These include full agonist treatment (eg, methadone) and partial agonist treatment (eg, buprenorphine).³ Alternatively, opioid antagonist therapies (eg, naltrexone) have also been found to be effective for treating OUD.^1,2,4 This article focuses on partial agonist treatment for OUD, specifically using a buprenorphine microdosing strategy to transition a patient from methadone to buprenorphine.

Buprenorphine for OUD

Buprenorphine binds with high affinity to the mu-opioid receptor, resulting in partial agonism of the receptor.^1,2 Buprenorphine has a higher therapeutic index and lower intrinsic agonist activity than other opioids and a low incidence of adverse effects. Due to the partial agonism at the mu receptor, its analgesic effects plateau at higher doses and exhibit antagonist properties.^1,2 This distinct “ceiling” effect, combined with a lower risk of respiratory depression, makes buprenorphine significantly safer than methadone.⁴ Additionally, it has a lower potential for misuse when used with an abuse deterrent such as naloxone.

Common reasons for transitioning a patient from methadone to buprenorphine include intolerable adverse effects of methadone, variable duration of efficacy, drug-drug interactions, or limited access to an opioid treatment program. Traditional buprenorphine induction requires moderate withdrawal before initiating therapy. Due to buprenorphine’s high affinity and partial agonism at the mu receptor, it competes with other opioids (eg, heroin, methadone) and will abruptly displace the receptor’s full agonist with a lower affinity, resulting in precipitated withdrawal.^1,3,5 To avoid precipitated withdrawal, it is recommended to leave a sufficient amount of time between full opioid agonist treatment and buprenorphine treatment, a process called “opioid washout.”^1,5 Depending on the duration, amount, and specific opioid used, the amount of time between ending opioid agonist treatment and initiating buprenorphine treatment may vary. As a result, many patients who attempt to transition from methadone to buprenorphine remain on methadone due to their inability to tolerate withdrawal. Additionally, given the risk of precipitating withdrawal, initiating buprenorphine may negatively impact pain control.¹

Recently, buprenorphine “microdosing” inductions, which do not require patients to be in opioid withdrawal, have been used to overcome some of the challenges of transitioning patients from methadone to buprenorphine.²

Buprenorphine microdosing techniques

Multiple methods of microdosing buprenorphine have been used in both inpatient and outpatient settings.

Bernese method. In 1997, Mendelson et al⁶ completed a trial with 5 patients maintained on methadone. They found that IV buprenorphine 0.2 mg every 24 hours did not produce a withdrawal effect and was comparable to placebo.⁶ Haamig et al⁵ hypothesized that repetitive administration of buprenorphine at minute doses in adequate dosing intervals would not cause withdrawal. Additionally, because of its high receptor binding affinity, buprenorphine will accumulate over time at the mu receptor. Thus, eventually the full mu agonist (eg, methadone) will be replaced by buprenorphine at the mu receptor as the receptor becomes saturated.^4,5

Continue to: The goal is to taper...

The goal is to taper the opioid agonist therapy while titrating buprenorphine. This taper method is not described in current treatment guidelines, and as a result, there are differences in doses used in each taper because the amount of opioid agonist and type of opioid agonist therapy can vary. In most cases, buprenorphine is initiated at 0.25 mg/d to 0.5 mg/d and increased by 0.25 mg/d to 1 mg/d as tolerated.^4,5 The dose of the full opioid agonist is slowly decreased as the buprenorphine dose increases. The Bernese method does not require frequent dosing, so it is a favorable option for outpatient therapy.⁴ One limitation to this method is that it is necessary to divide tablets into small doses.⁴ Additionally, adherence issues may disrupt the tapering method; therefore, some patients may not be appropriate candidates.⁴

Transdermal patch method. This method aims to provide a consistent amount of buprenorphine—similar to dividing tablets into smaller doses as seen in the Bernese method—but with the goal of avoiding inconsistencies in dosing. Hess et al⁷ examined 22 patients with OUD who were maintained on methadone 60 mg/d to 100 mg/d. In the buprenorphine transdermal patch method, a 35 mcg/h buprenorphine patch was applied 12 hours after the patient’s final methadone dose.^1,7 This was intended to provide continuous delivery over 96 hours.¹ Additionally, small, incremental doses of sublingual buprenorphine (SL-BUP) were administered throughout the course of 5 days.¹ A potential strength of this method is that like the Bernese method, it may be completed in outpatient therapy.⁴ Potential limitations include time to initiation, off-label use, and related costs.

Rapid microdosing induction method. Contrary to typical microdosing, rapid microdosing induction requires buprenorphine to be administered every 3 to 4 hours.⁴ As with most buprenorphine microinduction protocols, this does not require a period of withdrawal prior to initiation and may be performed because of the 1-hour time to peak effect of buprenorphine.⁴ Due to the frequent dosing schedule, it is recommended to use this method in an inpatient setting.⁴ With rapid microdosing, an individual may receive SL-BUP 0.5 mg every 3 hours on Day 1, then 1 mg SL-BUP every 3 hours on Day 2. On Day 3, the individual may receive 12 mg SL-BUP with 2 mg as needed. A limitation of this method is that it must be performed in an inpatient setting.⁴

CASE CONTINUED

To ensure patient-inclusive care, clinicians should conduct a risk-benefit discussion with the patient regarding microdosing buprenorphine. Because Mr. M would like to be managed as an outpatient, rapid microdosing is not an option. Mr. M works with his care team to design a microdosing approach with the Bernese method. They initiate buprenorphine 0.5 mg/d and increase the dose by 0.5 mg to 1 mg from Day 2 to Day 8. The variance in buprenorphine titration occurs due to Mr. M’s tolerance and symptoms of withdrawal. The team decreases the methadone dose by 5 mg to 10 mg each day, depending on symptoms of withdrawal, and discontinues therapy on Day 8. Throughout the microdosing induction, Mr. M does not experience withdrawal symptoms and is now managed on buprenorphine 12 mg/d.

Related Resources

• Van Hale C, Gluck R, Tang Y. Laboratory monitoring for patients on buprenorphine: 10 questions. Current Psychiatry. 2022;21(9):12-15,20-21,26.
• Moreno JL, Johnson JL, Peckham AM. Sublingual buprenorphine plus buprenorphine XR for opioid use disorder. Current Psychiatry. 2022;21(6):39-42,49.

Drug Brand Names

Amiodarone • Cordarone
Buprenorphine • Subutex, Sublocade
Buprenorphine/naloxone • Suboxone, Zubsolv
Methadone • Dolophine, Methadose
Naltrexone • ReVia, Vivitrol

Mr. M, age 46, has opioid use disorder (OUD). He is currently stabilized on methadone 80 mg/d but presents to your hospital with uncontrolled atrial fibrillation. After Mr. M is admitted, the care team looks to start amiodarone; however, they receive notice of a drug-drug interaction that may cause QTc prolongation. Mr. M agrees to switch to another medication to treat his OUD because he is tired of the regulated process required to receive methadone. The care team would like to taper him to a different OUD medication but would like Mr. M to avoid cravings, symptoms of withdrawal, and potential relapse.

The opioid epidemic has devastated the United States, causing approximately 130 deaths per day.¹ The economic burden of this epidemic on medical, social welfare, and correctional services is approximately $1 trillion annually.² Research supports opioid replacement therapy for treating OUD.¹ Multiple types of opioid replacement therapies are available in multiple dosage forms; all act on the mu-opioid receptor. These include full agonist treatment (eg, methadone) and partial agonist treatment (eg, buprenorphine).³ Alternatively, opioid antagonist therapies (eg, naltrexone) have also been found to be effective for treating OUD.^1,2,4 This article focuses on partial agonist treatment for OUD, specifically using a buprenorphine microdosing strategy to transition a patient from methadone to buprenorphine.

Buprenorphine for OUD

Buprenorphine binds with high affinity to the mu-opioid receptor, resulting in partial agonism of the receptor.^1,2 Buprenorphine has a higher therapeutic index and lower intrinsic agonist activity than other opioids and a low incidence of adverse effects. Due to the partial agonism at the mu receptor, its analgesic effects plateau at higher doses and exhibit antagonist properties.^1,2 This distinct “ceiling” effect, combined with a lower risk of respiratory depression, makes buprenorphine significantly safer than methadone.⁴ Additionally, it has a lower potential for misuse when used with an abuse deterrent such as naloxone.

Common reasons for transitioning a patient from methadone to buprenorphine include intolerable adverse effects of methadone, variable duration of efficacy, drug-drug interactions, or limited access to an opioid treatment program. Traditional buprenorphine induction requires moderate withdrawal before initiating therapy. Due to buprenorphine’s high affinity and partial agonism at the mu receptor, it competes with other opioids (eg, heroin, methadone) and will abruptly displace the receptor’s full agonist with a lower affinity, resulting in precipitated withdrawal.^1,3,5 To avoid precipitated withdrawal, it is recommended to leave a sufficient amount of time between full opioid agonist treatment and buprenorphine treatment, a process called “opioid washout.”^1,5 Depending on the duration, amount, and specific opioid used, the amount of time between ending opioid agonist treatment and initiating buprenorphine treatment may vary. As a result, many patients who attempt to transition from methadone to buprenorphine remain on methadone due to their inability to tolerate withdrawal. Additionally, given the risk of precipitating withdrawal, initiating buprenorphine may negatively impact pain control.¹

Recently, buprenorphine “microdosing” inductions, which do not require patients to be in opioid withdrawal, have been used to overcome some of the challenges of transitioning patients from methadone to buprenorphine.²

Buprenorphine microdosing techniques

Multiple methods of microdosing buprenorphine have been used in both inpatient and outpatient settings.

Bernese method. In 1997, Mendelson et al⁶ completed a trial with 5 patients maintained on methadone. They found that IV buprenorphine 0.2 mg every 24 hours did not produce a withdrawal effect and was comparable to placebo.⁶ Haamig et al⁵ hypothesized that repetitive administration of buprenorphine at minute doses in adequate dosing intervals would not cause withdrawal. Additionally, because of its high receptor binding affinity, buprenorphine will accumulate over time at the mu receptor. Thus, eventually the full mu agonist (eg, methadone) will be replaced by buprenorphine at the mu receptor as the receptor becomes saturated.^4,5

Continue to: The goal is to taper...

The goal is to taper the opioid agonist therapy while titrating buprenorphine. This taper method is not described in current treatment guidelines, and as a result, there are differences in doses used in each taper because the amount of opioid agonist and type of opioid agonist therapy can vary. In most cases, buprenorphine is initiated at 0.25 mg/d to 0.5 mg/d and increased by 0.25 mg/d to 1 mg/d as tolerated.^4,5 The dose of the full opioid agonist is slowly decreased as the buprenorphine dose increases. The Bernese method does not require frequent dosing, so it is a favorable option for outpatient therapy.⁴ One limitation to this method is that it is necessary to divide tablets into small doses.⁴ Additionally, adherence issues may disrupt the tapering method; therefore, some patients may not be appropriate candidates.⁴

Transdermal patch method. This method aims to provide a consistent amount of buprenorphine—similar to dividing tablets into smaller doses as seen in the Bernese method—but with the goal of avoiding inconsistencies in dosing. Hess et al⁷ examined 22 patients with OUD who were maintained on methadone 60 mg/d to 100 mg/d. In the buprenorphine transdermal patch method, a 35 mcg/h buprenorphine patch was applied 12 hours after the patient’s final methadone dose.^1,7 This was intended to provide continuous delivery over 96 hours.¹ Additionally, small, incremental doses of sublingual buprenorphine (SL-BUP) were administered throughout the course of 5 days.¹ A potential strength of this method is that like the Bernese method, it may be completed in outpatient therapy.⁴ Potential limitations include time to initiation, off-label use, and related costs.

Rapid microdosing induction method. Contrary to typical microdosing, rapid microdosing induction requires buprenorphine to be administered every 3 to 4 hours.⁴ As with most buprenorphine microinduction protocols, this does not require a period of withdrawal prior to initiation and may be performed because of the 1-hour time to peak effect of buprenorphine.⁴ Due to the frequent dosing schedule, it is recommended to use this method in an inpatient setting.⁴ With rapid microdosing, an individual may receive SL-BUP 0.5 mg every 3 hours on Day 1, then 1 mg SL-BUP every 3 hours on Day 2. On Day 3, the individual may receive 12 mg SL-BUP with 2 mg as needed. A limitation of this method is that it must be performed in an inpatient setting.⁴

CASE CONTINUED

To ensure patient-inclusive care, clinicians should conduct a risk-benefit discussion with the patient regarding microdosing buprenorphine. Because Mr. M would like to be managed as an outpatient, rapid microdosing is not an option. Mr. M works with his care team to design a microdosing approach with the Bernese method. They initiate buprenorphine 0.5 mg/d and increase the dose by 0.5 mg to 1 mg from Day 2 to Day 8. The variance in buprenorphine titration occurs due to Mr. M’s tolerance and symptoms of withdrawal. The team decreases the methadone dose by 5 mg to 10 mg each day, depending on symptoms of withdrawal, and discontinues therapy on Day 8. Throughout the microdosing induction, Mr. M does not experience withdrawal symptoms and is now managed on buprenorphine 12 mg/d.

Related Resources

• Van Hale C, Gluck R, Tang Y. Laboratory monitoring for patients on buprenorphine: 10 questions. Current Psychiatry. 2022;21(9):12-15,20-21,26.
• Moreno JL, Johnson JL, Peckham AM. Sublingual buprenorphine plus buprenorphine XR for opioid use disorder. Current Psychiatry. 2022;21(6):39-42,49.

Drug Brand Names

Amiodarone • Cordarone
Buprenorphine • Subutex, Sublocade
Buprenorphine/naloxone • Suboxone, Zubsolv
Methadone • Dolophine, Methadose
Naltrexone • ReVia, Vivitrol

CASE Agitation and bizarre behavior

Ms. L, age 40, presents to the emergency department (ED) for altered mental status and bizarre behavior. Before arriving at the ED, she had experienced a severe headache and an episode of vomiting. At home she had been irritable and agitated, repetitively dressing and undressing, urinating outside the toilet, and opening and closing water faucets in the house. She also had stopped eating and drinking. Ms. L’s home medications consist of levothyroxine 100 mcg/d for hypothyroidism.

In the ED, Ms. L has severe psychomotor agitation. She is restless and displays purposeless repetitive movements with her hands. She is mostly mute, but does groan at times.

HISTORY Multiple trips to the ED

In addition to hypothyroidism, Ms. L has a history of migraines and asthma. Four days before presenting to the ED, she complained of a severe headache and generalized fatigue, with vomiting and nausea. Two days later, she presented to the ED at a different hospital and underwent a brain CT scan; the results were unremarkable. At that facility, a laboratory work-up—including complete blood count, urea, creatinine, C-reactive protein, electrolytes, magnesium, phosphorus, calcium, full liver function tests, amylase, lipase, bilirubin, thyroid function test, and beta-human chorionic gonadotropin—was normal except for low thyroid-stimulating hormone levels (0.016 mIU/L). Ms. L was diagnosed with a severe migraine attack and discharged home with instructions to follow up with her endocrinologist.

Ms. L has no previous psychiatric history. Her family’s psychiatric history includes depression with psychotic features (mother), depression (maternal aunt), and generalized anxiety disorder (mother’s maternal aunt).

[polldaddy:11252938]

The authors’ observations

Catatonia is a behavioral syndrome with heterogeneous signs and symptoms. According to DSM-5, the diagnosis is considered when a patient presents with ≥3 of the 12 signs outlined in Table 1.¹ It usually occurs in the context of an underlying psychiatric disorder such as schizophrenia or depression, or a medical disorder such as CNS infection or encephalopathy due to metabolic causes.¹ Ms. L exhibited mutism, negativism, mannerism, stereotypy, and agitation and thus met the criteria for a catatonia diagnosis.

EVALUATION Unexpected finding on physical exam

In the ED, Ms. L is hemodynamically stable. Her blood pressure is 140/80 mm Hg; heart rate is 103 beats per minute; oxygen saturation is 98%; respiratory rate is 14 breaths per minute; and temperature is 37.5° C. Results from a brain MRI and total body scan performed prior to admission are unremarkable.

Ms. L is admitted to the psychiatric ward under the care of neurology for a psychiatry consultation. For approximately 24 hours, she receives IV diazepam 5 mg every 8 hours (due to the unavailability of lorazepam) for management of her catatonic symptoms, and olanzapine 10 mg every 8 hours orally as needed for agitation. Collateral history rules out a current mood episode or onset of psychosis in the weeks before she came to the ED. Diazepam improves Ms. L’s psychomotor agitation, which allows the primary team an opportunity to examine her.

Continue to: A physical exam reveals...

A physical exam reveals small vesicular lesions (1 to 2 cm in diameter) on an erythematous base on the left breast associated with an erythematous plaque with no evident vesicles on the left inner arm. The vesicular lesions display in a segmented pattern of dermatomal distribution.

[polldaddy:11252941]

The authors’ observations

Catatonic symptoms, coupled with psychomotor agitation in an immunocompetent middle-aged adult with a history of migraine headaches, strong family history of severe mental illness, and noncontributory findings on brain imaging, prompted a Psychiatry consultation and administration of psychotropic medications. A thorough physical exam revealing the small area of shingles and acute altered mental status prompted more aggressive investigations to explore the possibility of encephalitis.

Physicians should have a low index of suspicion for encephalitis (viral, bacterial, autoimmune, etc) and perform a lumbar puncture (LP) when necessary, despite the invasiveness of this test. A direct physical examination is often underutilized, notably in psychiatric patients, which can lead to the omission of important clinical information.² Normal vital signs, blood workup, and MRI before admission are not sufficient to correctly guide diagnosis.

EVALUATION Additional lab results establish the diagnosis

An LP reveals Ms. L’s protein levels are 44 mg/dL, her glucose levels are 85 mg/dL, red blood cell count is 4/µL, and white blood cell count is 200/µL with 92% lymphocytes and 1% neutrophils. Ms. L’s CSF analysis profile indicates a viral CNS infection (Table 2³).

[polldaddy:11252943]

The authors’ observations

Varicella-zoster virus (VZV) and herpes simplex virus (HSV) are human neurotropic alphaherpesviruses that cause lifelong infections in ganglia, and their reactivation can come in the form of encephalitis.⁴

Continue to: Ms. L's clinical presentation...

Ms. L’s clinical presentation most likely implicated VZV. Skin lesions of VZV may look exactly like HSV, with clustered vesicles on an erythematous base (Figure⁵). However, VZV rash tends to follow a dermatomal distribution (as in Ms. L’s case), which can help distinguish it from herpetic lesions.

Ms. L’s case shows the importance of early recognition of VZV infection. The diagnosis is confirmed through CSF analysis. There is an urgency to promptly conduct the LP to confirm the diagnosis and quickly initiate antiviral treatment to stop the progression of the infection and its life-threatening sequelae.

In the absence of underlying medical cause, typical treatment of catatonia involves the sublingual or IM administration of 1 to 2 mg lorazepam that can be repeated twice at 3-hour intervals if the patient’s symptoms do not resolve. ECT is indicated if the patient experiences minimal or no response to lorazepam.

The use of antipsychotics for catatonia is controversial. High-potency antipsychotics such as haloperidol and risperidone are not recommended due to increased risk of the progression of catatonia into neuroleptic malignant syndrome.⁷

Continue to: OUTCOME Prompt recovery with an antiviral

OUTCOME Prompt recovery with an antiviral

Ms. L receives IV acyclovir 1,200 mg every 8 hours for 14 days. Just 48 hours after starting this antiviral medication, her bizarre behavior and catatonic features cease, and she returns to her baseline mental functioning. Olanzapine is discontinued, and lorazepam is progressively decreased. The CSF polymerase chain reaction assay indicates Ms. L is positive for VZV, which confirms the diagnosis of VZV encephalitis. A spine MRI is also performed and rules out myelitis as a sequela of the infection.

The authors’ observations

Chickenpox is caused by a primary encounter with VZV. Inside the ganglions of neurons, a dormant form of VZV resides. Its reactivation leads to the spread of the infection to the skin innervated by these neurons, causing shingles. Reactivation occurs in approximately 1 million people in the United States each year. The annual incidence is 5 to 6.5 cases per 1,000 people at age 60, and 8 to 11 cases per 1,000 people at age 70.⁸

In 2006, the FDA approved the first zoster vaccine (Zostavax) for use in nonimmunocompromised, VZV-seropositive adults age >60 (later lowered to age 50). This vaccine reduces the incidence of shingles by 51%, the incidence of postherpetic neuralgia by 66%, and the burden of illness by 61%. In 2017, the FDA approved a second VZV vaccine (Shingrix, recombinant nonlive vaccine). In 2021, Shingrix was approved for use in immunosuppressed patients.⁹

Reactivation of VZV starts with a prodromal phase, characterized by pain, itching, numbness, and dysesthesias in 1 to 3 dermatomes. A maculopapular rash appears on the affected area a few days later, evolving into vesicles that scab over in 10 days.¹⁰

Dissemination of the virus leading specifically to VZV encephalitis typically occurs in immunosuppressed individuals and older patients. According to the World Health Organization, encephalitis is a life-threatening complication of VZV and occurs in 1 of 33,000 to 50,000 cases.¹¹

Continue to: Delay in the diagnosis...

Delay in the diagnosis and treatment of VZV encephalitis can be detrimental or even fatal. Kodadhala et al¹² found that the mortality rate for VZV encephalitis is 5% to 10% and ≤80% in immunosuppressed individuals.

Sometimes, VZV encephalitis can masquerade as a psychiatric presentation. Few cases presenting with acute or delayed neuro­psychiatric symptoms related to VZV encephalitis have been previously reported in the literature. Some are summarized in Table 3^13,14 and Table 4.^15,16

To our knowledge, this is the first case report of catatonia as a presentation of VZV encephalitis. The catatonic presentation has been previously described in autoimmune encephalitis such as N-methyl-D-aspartate receptor encephalitis, due to glutamatergic hypofunction.¹⁷

Bottom Line

In the setting of a patient with an abrupt change in mental status/behavior, physicians must be aware of the importance of a thorough physical examination to better ascertain a diagnosis and to rule out an underlying medical disorder. Reactivation of varicella-zoster virus (VZV) can result in encephalitis that might masquerade as a psychiatric presentation, including symptoms of catatonia.

Related Resources

• Baum ML, Johnson MC, Lizano P. Is it psychosis, or an autoimmune encephalitis? Current Psychiatry. 2022;21(8): 31-38,44. doi:10.12788/cp.0273
• Reinfold S. Are we failing to diagnose and treat the many faces of catatonia? Current Psychiatry. 2022;21(1):e3-e5. doi:10.12788/cp.0208

Drug Brand Names

Acyclovir • Sitavig
Diazepam • Valium
Haloperidol • Haldol
Lorazepam • Ativan
Levothyroxine • Levoxyl
Olanzapine • Zyprexa
Risperidone • Risperdal

CASE Agitation and bizarre behavior

Ms. L, age 40, presents to the emergency department (ED) for altered mental status and bizarre behavior. Before arriving at the ED, she had experienced a severe headache and an episode of vomiting. At home she had been irritable and agitated, repetitively dressing and undressing, urinating outside the toilet, and opening and closing water faucets in the house. She also had stopped eating and drinking. Ms. L’s home medications consist of levothyroxine 100 mcg/d for hypothyroidism.

In the ED, Ms. L has severe psychomotor agitation. She is restless and displays purposeless repetitive movements with her hands. She is mostly mute, but does groan at times.

HISTORY Multiple trips to the ED

In addition to hypothyroidism, Ms. L has a history of migraines and asthma. Four days before presenting to the ED, she complained of a severe headache and generalized fatigue, with vomiting and nausea. Two days later, she presented to the ED at a different hospital and underwent a brain CT scan; the results were unremarkable. At that facility, a laboratory work-up—including complete blood count, urea, creatinine, C-reactive protein, electrolytes, magnesium, phosphorus, calcium, full liver function tests, amylase, lipase, bilirubin, thyroid function test, and beta-human chorionic gonadotropin—was normal except for low thyroid-stimulating hormone levels (0.016 mIU/L). Ms. L was diagnosed with a severe migraine attack and discharged home with instructions to follow up with her endocrinologist.

Ms. L has no previous psychiatric history. Her family’s psychiatric history includes depression with psychotic features (mother), depression (maternal aunt), and generalized anxiety disorder (mother’s maternal aunt).

[polldaddy:11252938]

The authors’ observations

Catatonia is a behavioral syndrome with heterogeneous signs and symptoms. According to DSM-5, the diagnosis is considered when a patient presents with ≥3 of the 12 signs outlined in Table 1.¹ It usually occurs in the context of an underlying psychiatric disorder such as schizophrenia or depression, or a medical disorder such as CNS infection or encephalopathy due to metabolic causes.¹ Ms. L exhibited mutism, negativism, mannerism, stereotypy, and agitation and thus met the criteria for a catatonia diagnosis.

EVALUATION Unexpected finding on physical exam

In the ED, Ms. L is hemodynamically stable. Her blood pressure is 140/80 mm Hg; heart rate is 103 beats per minute; oxygen saturation is 98%; respiratory rate is 14 breaths per minute; and temperature is 37.5° C. Results from a brain MRI and total body scan performed prior to admission are unremarkable.

Ms. L is admitted to the psychiatric ward under the care of neurology for a psychiatry consultation. For approximately 24 hours, she receives IV diazepam 5 mg every 8 hours (due to the unavailability of lorazepam) for management of her catatonic symptoms, and olanzapine 10 mg every 8 hours orally as needed for agitation. Collateral history rules out a current mood episode or onset of psychosis in the weeks before she came to the ED. Diazepam improves Ms. L’s psychomotor agitation, which allows the primary team an opportunity to examine her.

Continue to: A physical exam reveals...

A physical exam reveals small vesicular lesions (1 to 2 cm in diameter) on an erythematous base on the left breast associated with an erythematous plaque with no evident vesicles on the left inner arm. The vesicular lesions display in a segmented pattern of dermatomal distribution.

[polldaddy:11252941]

The authors’ observations

Catatonic symptoms, coupled with psychomotor agitation in an immunocompetent middle-aged adult with a history of migraine headaches, strong family history of severe mental illness, and noncontributory findings on brain imaging, prompted a Psychiatry consultation and administration of psychotropic medications. A thorough physical exam revealing the small area of shingles and acute altered mental status prompted more aggressive investigations to explore the possibility of encephalitis.

Physicians should have a low index of suspicion for encephalitis (viral, bacterial, autoimmune, etc) and perform a lumbar puncture (LP) when necessary, despite the invasiveness of this test. A direct physical examination is often underutilized, notably in psychiatric patients, which can lead to the omission of important clinical information.² Normal vital signs, blood workup, and MRI before admission are not sufficient to correctly guide diagnosis.

EVALUATION Additional lab results establish the diagnosis

An LP reveals Ms. L’s protein levels are 44 mg/dL, her glucose levels are 85 mg/dL, red blood cell count is 4/µL, and white blood cell count is 200/µL with 92% lymphocytes and 1% neutrophils. Ms. L’s CSF analysis profile indicates a viral CNS infection (Table 2³).

[polldaddy:11252943]

The authors’ observations

Varicella-zoster virus (VZV) and herpes simplex virus (HSV) are human neurotropic alphaherpesviruses that cause lifelong infections in ganglia, and their reactivation can come in the form of encephalitis.⁴

Continue to: Ms. L's clinical presentation...

Ms. L’s clinical presentation most likely implicated VZV. Skin lesions of VZV may look exactly like HSV, with clustered vesicles on an erythematous base (Figure⁵). However, VZV rash tends to follow a dermatomal distribution (as in Ms. L’s case), which can help distinguish it from herpetic lesions.

Ms. L’s case shows the importance of early recognition of VZV infection. The diagnosis is confirmed through CSF analysis. There is an urgency to promptly conduct the LP to confirm the diagnosis and quickly initiate antiviral treatment to stop the progression of the infection and its life-threatening sequelae.

In the absence of underlying medical cause, typical treatment of catatonia involves the sublingual or IM administration of 1 to 2 mg lorazepam that can be repeated twice at 3-hour intervals if the patient’s symptoms do not resolve. ECT is indicated if the patient experiences minimal or no response to lorazepam.

The use of antipsychotics for catatonia is controversial. High-potency antipsychotics such as haloperidol and risperidone are not recommended due to increased risk of the progression of catatonia into neuroleptic malignant syndrome.⁷

Continue to: OUTCOME Prompt recovery with an antiviral

OUTCOME Prompt recovery with an antiviral

Ms. L receives IV acyclovir 1,200 mg every 8 hours for 14 days. Just 48 hours after starting this antiviral medication, her bizarre behavior and catatonic features cease, and she returns to her baseline mental functioning. Olanzapine is discontinued, and lorazepam is progressively decreased. The CSF polymerase chain reaction assay indicates Ms. L is positive for VZV, which confirms the diagnosis of VZV encephalitis. A spine MRI is also performed and rules out myelitis as a sequela of the infection.

The authors’ observations

Chickenpox is caused by a primary encounter with VZV. Inside the ganglions of neurons, a dormant form of VZV resides. Its reactivation leads to the spread of the infection to the skin innervated by these neurons, causing shingles. Reactivation occurs in approximately 1 million people in the United States each year. The annual incidence is 5 to 6.5 cases per 1,000 people at age 60, and 8 to 11 cases per 1,000 people at age 70.⁸

In 2006, the FDA approved the first zoster vaccine (Zostavax) for use in nonimmunocompromised, VZV-seropositive adults age >60 (later lowered to age 50). This vaccine reduces the incidence of shingles by 51%, the incidence of postherpetic neuralgia by 66%, and the burden of illness by 61%. In 2017, the FDA approved a second VZV vaccine (Shingrix, recombinant nonlive vaccine). In 2021, Shingrix was approved for use in immunosuppressed patients.⁹

Reactivation of VZV starts with a prodromal phase, characterized by pain, itching, numbness, and dysesthesias in 1 to 3 dermatomes. A maculopapular rash appears on the affected area a few days later, evolving into vesicles that scab over in 10 days.¹⁰

Dissemination of the virus leading specifically to VZV encephalitis typically occurs in immunosuppressed individuals and older patients. According to the World Health Organization, encephalitis is a life-threatening complication of VZV and occurs in 1 of 33,000 to 50,000 cases.¹¹

Continue to: Delay in the diagnosis...

Delay in the diagnosis and treatment of VZV encephalitis can be detrimental or even fatal. Kodadhala et al¹² found that the mortality rate for VZV encephalitis is 5% to 10% and ≤80% in immunosuppressed individuals.

Sometimes, VZV encephalitis can masquerade as a psychiatric presentation. Few cases presenting with acute or delayed neuro­psychiatric symptoms related to VZV encephalitis have been previously reported in the literature. Some are summarized in Table 3^13,14 and Table 4.^15,16

To our knowledge, this is the first case report of catatonia as a presentation of VZV encephalitis. The catatonic presentation has been previously described in autoimmune encephalitis such as N-methyl-D-aspartate receptor encephalitis, due to glutamatergic hypofunction.¹⁷

Bottom Line

In the setting of a patient with an abrupt change in mental status/behavior, physicians must be aware of the importance of a thorough physical examination to better ascertain a diagnosis and to rule out an underlying medical disorder. Reactivation of varicella-zoster virus (VZV) can result in encephalitis that might masquerade as a psychiatric presentation, including symptoms of catatonia.

Related Resources

• Baum ML, Johnson MC, Lizano P. Is it psychosis, or an autoimmune encephalitis? Current Psychiatry. 2022;21(8): 31-38,44. doi:10.12788/cp.0273
• Reinfold S. Are we failing to diagnose and treat the many faces of catatonia? Current Psychiatry. 2022;21(1):e3-e5. doi:10.12788/cp.0208

Drug Brand Names

Acyclovir • Sitavig
Diazepam • Valium
Haloperidol • Haldol
Lorazepam • Ativan
Levothyroxine • Levoxyl
Olanzapine • Zyprexa
Risperidone • Risperdal

CASE Agitation and bizarre behavior

Ms. L, age 40, presents to the emergency department (ED) for altered mental status and bizarre behavior. Before arriving at the ED, she had experienced a severe headache and an episode of vomiting. At home she had been irritable and agitated, repetitively dressing and undressing, urinating outside the toilet, and opening and closing water faucets in the house. She also had stopped eating and drinking. Ms. L’s home medications consist of levothyroxine 100 mcg/d for hypothyroidism.

In the ED, Ms. L has severe psychomotor agitation. She is restless and displays purposeless repetitive movements with her hands. She is mostly mute, but does groan at times.

HISTORY Multiple trips to the ED

In addition to hypothyroidism, Ms. L has a history of migraines and asthma. Four days before presenting to the ED, she complained of a severe headache and generalized fatigue, with vomiting and nausea. Two days later, she presented to the ED at a different hospital and underwent a brain CT scan; the results were unremarkable. At that facility, a laboratory work-up—including complete blood count, urea, creatinine, C-reactive protein, electrolytes, magnesium, phosphorus, calcium, full liver function tests, amylase, lipase, bilirubin, thyroid function test, and beta-human chorionic gonadotropin—was normal except for low thyroid-stimulating hormone levels (0.016 mIU/L). Ms. L was diagnosed with a severe migraine attack and discharged home with instructions to follow up with her endocrinologist.

Ms. L has no previous psychiatric history. Her family’s psychiatric history includes depression with psychotic features (mother), depression (maternal aunt), and generalized anxiety disorder (mother’s maternal aunt).

[polldaddy:11252938]

The authors’ observations

Catatonia is a behavioral syndrome with heterogeneous signs and symptoms. According to DSM-5, the diagnosis is considered when a patient presents with ≥3 of the 12 signs outlined in Table 1.¹ It usually occurs in the context of an underlying psychiatric disorder such as schizophrenia or depression, or a medical disorder such as CNS infection or encephalopathy due to metabolic causes.¹ Ms. L exhibited mutism, negativism, mannerism, stereotypy, and agitation and thus met the criteria for a catatonia diagnosis.

EVALUATION Unexpected finding on physical exam

In the ED, Ms. L is hemodynamically stable. Her blood pressure is 140/80 mm Hg; heart rate is 103 beats per minute; oxygen saturation is 98%; respiratory rate is 14 breaths per minute; and temperature is 37.5° C. Results from a brain MRI and total body scan performed prior to admission are unremarkable.

Ms. L is admitted to the psychiatric ward under the care of neurology for a psychiatry consultation. For approximately 24 hours, she receives IV diazepam 5 mg every 8 hours (due to the unavailability of lorazepam) for management of her catatonic symptoms, and olanzapine 10 mg every 8 hours orally as needed for agitation. Collateral history rules out a current mood episode or onset of psychosis in the weeks before she came to the ED. Diazepam improves Ms. L’s psychomotor agitation, which allows the primary team an opportunity to examine her.

Continue to: A physical exam reveals...

A physical exam reveals small vesicular lesions (1 to 2 cm in diameter) on an erythematous base on the left breast associated with an erythematous plaque with no evident vesicles on the left inner arm. The vesicular lesions display in a segmented pattern of dermatomal distribution.

[polldaddy:11252941]

The authors’ observations

Catatonic symptoms, coupled with psychomotor agitation in an immunocompetent middle-aged adult with a history of migraine headaches, strong family history of severe mental illness, and noncontributory findings on brain imaging, prompted a Psychiatry consultation and administration of psychotropic medications. A thorough physical exam revealing the small area of shingles and acute altered mental status prompted more aggressive investigations to explore the possibility of encephalitis.

Physicians should have a low index of suspicion for encephalitis (viral, bacterial, autoimmune, etc) and perform a lumbar puncture (LP) when necessary, despite the invasiveness of this test. A direct physical examination is often underutilized, notably in psychiatric patients, which can lead to the omission of important clinical information.² Normal vital signs, blood workup, and MRI before admission are not sufficient to correctly guide diagnosis.

EVALUATION Additional lab results establish the diagnosis

An LP reveals Ms. L’s protein levels are 44 mg/dL, her glucose levels are 85 mg/dL, red blood cell count is 4/µL, and white blood cell count is 200/µL with 92% lymphocytes and 1% neutrophils. Ms. L’s CSF analysis profile indicates a viral CNS infection (Table 2³).

[polldaddy:11252943]

The authors’ observations

Varicella-zoster virus (VZV) and herpes simplex virus (HSV) are human neurotropic alphaherpesviruses that cause lifelong infections in ganglia, and their reactivation can come in the form of encephalitis.⁴

Continue to: Ms. L's clinical presentation...

Ms. L’s clinical presentation most likely implicated VZV. Skin lesions of VZV may look exactly like HSV, with clustered vesicles on an erythematous base (Figure⁵). However, VZV rash tends to follow a dermatomal distribution (as in Ms. L’s case), which can help distinguish it from herpetic lesions.

Ms. L’s case shows the importance of early recognition of VZV infection. The diagnosis is confirmed through CSF analysis. There is an urgency to promptly conduct the LP to confirm the diagnosis and quickly initiate antiviral treatment to stop the progression of the infection and its life-threatening sequelae.

In the absence of underlying medical cause, typical treatment of catatonia involves the sublingual or IM administration of 1 to 2 mg lorazepam that can be repeated twice at 3-hour intervals if the patient’s symptoms do not resolve. ECT is indicated if the patient experiences minimal or no response to lorazepam.

The use of antipsychotics for catatonia is controversial. High-potency antipsychotics such as haloperidol and risperidone are not recommended due to increased risk of the progression of catatonia into neuroleptic malignant syndrome.⁷

Continue to: OUTCOME Prompt recovery with an antiviral

OUTCOME Prompt recovery with an antiviral

Ms. L receives IV acyclovir 1,200 mg every 8 hours for 14 days. Just 48 hours after starting this antiviral medication, her bizarre behavior and catatonic features cease, and she returns to her baseline mental functioning. Olanzapine is discontinued, and lorazepam is progressively decreased. The CSF polymerase chain reaction assay indicates Ms. L is positive for VZV, which confirms the diagnosis of VZV encephalitis. A spine MRI is also performed and rules out myelitis as a sequela of the infection.

The authors’ observations

Chickenpox is caused by a primary encounter with VZV. Inside the ganglions of neurons, a dormant form of VZV resides. Its reactivation leads to the spread of the infection to the skin innervated by these neurons, causing shingles. Reactivation occurs in approximately 1 million people in the United States each year. The annual incidence is 5 to 6.5 cases per 1,000 people at age 60, and 8 to 11 cases per 1,000 people at age 70.⁸

In 2006, the FDA approved the first zoster vaccine (Zostavax) for use in nonimmunocompromised, VZV-seropositive adults age >60 (later lowered to age 50). This vaccine reduces the incidence of shingles by 51%, the incidence of postherpetic neuralgia by 66%, and the burden of illness by 61%. In 2017, the FDA approved a second VZV vaccine (Shingrix, recombinant nonlive vaccine). In 2021, Shingrix was approved for use in immunosuppressed patients.⁹

Reactivation of VZV starts with a prodromal phase, characterized by pain, itching, numbness, and dysesthesias in 1 to 3 dermatomes. A maculopapular rash appears on the affected area a few days later, evolving into vesicles that scab over in 10 days.¹⁰

Dissemination of the virus leading specifically to VZV encephalitis typically occurs in immunosuppressed individuals and older patients. According to the World Health Organization, encephalitis is a life-threatening complication of VZV and occurs in 1 of 33,000 to 50,000 cases.¹¹

Continue to: Delay in the diagnosis...

Delay in the diagnosis and treatment of VZV encephalitis can be detrimental or even fatal. Kodadhala et al¹² found that the mortality rate for VZV encephalitis is 5% to 10% and ≤80% in immunosuppressed individuals.

Sometimes, VZV encephalitis can masquerade as a psychiatric presentation. Few cases presenting with acute or delayed neuro­psychiatric symptoms related to VZV encephalitis have been previously reported in the literature. Some are summarized in Table 3^13,14 and Table 4.^15,16

To our knowledge, this is the first case report of catatonia as a presentation of VZV encephalitis. The catatonic presentation has been previously described in autoimmune encephalitis such as N-methyl-D-aspartate receptor encephalitis, due to glutamatergic hypofunction.¹⁷

Bottom Line

In the setting of a patient with an abrupt change in mental status/behavior, physicians must be aware of the importance of a thorough physical examination to better ascertain a diagnosis and to rule out an underlying medical disorder. Reactivation of varicella-zoster virus (VZV) can result in encephalitis that might masquerade as a psychiatric presentation, including symptoms of catatonia.

Related Resources

• Baum ML, Johnson MC, Lizano P. Is it psychosis, or an autoimmune encephalitis? Current Psychiatry. 2022;21(8): 31-38,44. doi:10.12788/cp.0273
• Reinfold S. Are we failing to diagnose and treat the many faces of catatonia? Current Psychiatry. 2022;21(1):e3-e5. doi:10.12788/cp.0208

Drug Brand Names

Acyclovir • Sitavig
Diazepam • Valium
Haloperidol • Haldol
Lorazepam • Ativan
Levothyroxine • Levoxyl
Olanzapine • Zyprexa
Risperidone • Risperdal