Judicious use of stimulants may help patients with attention-deficit hyperactivity disorder (ADHD) and comorbid substance use disorder (SUD) stay in addiction treatment programs, research shows.
Dr. Kristopher A. Kast
Results of a 5-year retrospective cohort study showed adult patients with ADHD attending an addiction recovery program were five times less likely to drop out of care if they were receiving stimulant medication within the first 90 days, compared with their peers who received no medication.
“When considering the risks and benefits of ADHD pharmacotherapy and particularly stimulant therapy in the addiction clinic, we should really be thinking about the risk of treatment dropout and poor retention if we do not treat the ADHD syndrome,” study investigator Kristopher A. Kast, MD, Vanderbilt University, Nashville, Tenn., told this news organization.
The findings were presented at the American Academy of Addiction Psychiatry annual meeting, which was held online this year.
Comorbidity common
“This study matters because this clinical situation comes up a lot, where you have patients who are presenting in the substance use disorder clinic who are experiencing symptoms of ADHD and who have been on stimulant therapy either as a child or young adult in the past,” said Dr. Kast, who conducted this study while he was at Massachusetts General Hospital in Boston.
About 25% of patients presenting to outpatient substance use care meet criteria for an ADHD diagnosis, and having both conditions worsens ADHD and SUD outcomes, he noted.
“ADHD treatment would be helpful to these people, but often clinicians are reluctant to prescribe stimulant medication because it’s a controlled substance. Especially early on in treatment, we’re often worried that such a medication could destabilize the patient,” said Dr. Kast.
To examine the relationship between ADHD pharmacotherapy and retention in SUD treatment participants, the investigators assessed electronic medical record data from Mass General over a period of 5.5 years, from July 2014 to January 2020.
The data included information on 2,163 patients (63% men; mean age, 44 years) admitted to the addiction clinic. A total of 203 had a clinical diagnosis of ADHD (9.4%). Of these 203 participants, 171 were receiving ADHD pharmacotherapy and 32 were untreated.
Among all participants, the group with ADHD was significantly younger than the non-ADHD group (mean age, 38 vs. 45 years, respectively) and more likely to use cocaine (31% vs. 12%) and have private insurance (64% vs. 44%) (P < .001 for all comparisons).
Results showed ADHD stimulant therapy within the first 90 days of SUD treatment was a robust indication of retention. After adjusting for several variables, only ADHD pharmacotherapy was significantly associated with retention (hazard ratio, 0.59; 95% confidence interval, 0.4-0.9; P = .008).
“It was the only variable in a multivariate regression analysis that predicted longer-term retention. It was an even stronger predictor than Suboxone [buprenorphine and naloxone] therapy, with is traditionally strongly associated with retention,” Dr. Kast noted.
He added that, because this was a retrospective, nonrandomized study, it limited the ability to address confounding and unmeasured covariates.
“Our findings may not generalize to the undiagnosed group of patients who would be identified by standardized diagnostic instruments,” Kast said. “Future studies should address risk and number-needed-to-harm associated with ADHD pharmacotherapy.”