Evidence-Based Reviews

Comorbid bipolar disorder and substance abuse: Evidence-based options

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References

Lithium. Given its well-documented mood stabilizing effect, lithium would seem to be a reasonable option to treat BD-SUD patients, but scant evidence supports its role as an anti-alcohol or anti-drug medication (Table 1).13,14 Lithium’s efficacy was evaluated in a study of 25 adolescents suffering from mood disorders (mostly BD) and comorbid SUDs (mostly alcohol and cannabis) randomized to receive lithium or placebo for 6 weeks.13 Lithium was well tolerated and improved psychiatric symptoms. At week 3, patients receiving lithium produced fewer positive results on randomly administered urine drug screens than those receiving placebo.

However, lithium seems to have little efficacy in reducing cocaine use in cocaine-dependent patients with bipolar spectrum disorders.14 In an open-label study, 10 patients with a history of hypomania or cyclothymia received lithium monotherapy for 12 weeks. Although patients experienced improved mood symptoms and decreased cocaine use, the mean decrease was transitory and not statistically significant. Another factor that may limit lithium’s use for BD-SUD patients is that these patients are more likely to comply with valproate treatment than with lithium.15

Table 1

Lithium for BD patients with substance use disorders

StudyInterventionDesignSubstance use disorderResults
Geller et al, 199813Lithium vs placeboDouble-blind, placebo-controlledAlcohol and cannabis use disordersDecreased positive drug screen results
Nunes et al, 199014LithiumOpen labelCocaine abuseNonsignificant decrease in cocaine use
BD: bipolar disorder

Anticonvulsants. In a double-blind, placebo-controlled study of 59 alcohol-dependent bipolar I disorder patients, lithium plus divalproex sodium was superior to lithium plus placebo in decreasing number of drinking days and number of drinks per day and in increasing periods of abstinence (Table 2).16-19 Divalproex sodium was well tolerated and liver function improved in the divalproex sodium group compared with the placebo group, which probably was a benefit of decreased alcohol consumption. In addition, there was a strong association between mood symptoms and alcohol use, which suggests that maximizing mood symptom treatment may decrease alcohol use. However, the divalproex sodium and placebo groups did not differ in measures of mood symptoms, which implies that divalproex sodium might exhibit a positive effect on drinking regardless of its mood-stabilizing properties.

Divalproex sodium also has been used to treat BD comorbid with cocaine dependence. In a small open-label study, 15 patients receiving divalproex sodium plus counseling for mood and substance use disorders were followed for 6 weeks.17 The 7 patients who completed the trial had significantly more cocaine-abstinent days, spent less money on cocaine, and experienced fewer manic and depressive symptoms. However, divalproex sodium’s effect on cocaine use cannot be determined solely from this study because there was no placebo control group.

Despite its widespread use as a mood stabilizer and potential use in alcohol detoxification, carbamazepine scarcely has been studied in BD-SUD patients. A double-blind, placebo-controlled study of 139 cocaine-dependent patients with BD or other affective disorders found that patients taking carbamazepine for 12 weeks experienced modest reductions in positive urine drug screens and increased time to cocaine use.18 They also reported less cocaine craving than patients taking placebo, and mood symptoms (mostly depressive) improved.

An open-label study used lamotrigine as adjunctive therapy or monotherapy for 62 cocaine-dependent BD patients followed for 36 weeks.19 There was some decrease in cocaine craving, money spent on cocaine, and rate of depressive and manic symptoms, but no effect on cocaine use. A placebo-controlled trial is necessary to confirm these modest effects.

No studies have evaluated the potential role of topiramate in treating BD-SUD, despite its FDA-approved indication for alcoholism treatment. Topiramate’s well-known safety and tolerability profile in BD patients make it an interesting option for those with co-occurring alcohol dependence.

Table 2

Studies suggest anticonvulsants may reduce alcohol, cocaine use in BD patients

StudyInterventionDesignSubstance use disorderResults
Salloum et al, 200516Divalproex sodium plus lithium vs placebo plus lithiumDouble-blind, placebo-controlledAlcohol dependenceDecreased number of drinking days and number of drinks per day and increased time of abstinence
Salloum et al, 200717Divalproex sodiumOpen labelCocaine dependenceIncreased cocaine-abstinent days and decreased money spent on cocaine and cocaine use severity index
Brady et al,* 200218Carbamazepine vs placeboDouble-blind, placebo-controlledCocaine dependenceDecreased cocaine craving and cocaine use
Brown et al, 200619LamotrigineOpen labelCocaine dependenceDecreased cocaine craving and money spent on cocaine
*Sample included, but was not limited to, patients with BD
BD: bipolar disorder

Atypical antipsychotics. In an open-label study, 16 weeks of quetiapine monotherapy effectively decreased alcohol consumption, alcohol craving, and psychotic and affective symptoms in 28 alcoholics with a variety of psychiatric diagnoses, including BD, schizoaffective disorder, and borderline personality disorder (Table 3).20-24 However, in a double-blind study of augmentation with quetiapine or placebo for 102 alcohol-dependent BD patients, no significant differences in alcohol use were found between groups.21

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