Polypharmacy Among Patients With Major Depressive Disorder and Co-occurring Substance Use Disorders in a Psychiatric Hospital Setting: Prevalence and Risk Factors

Abstract

Background: Major depressive disorder (MDD) is common among patients admitted to a psychiatric hospital who frequently present with comorbid conditions such as substance use disorders (up to 50%). Polypharmacy (ie, being prescribed 3 or more medications) may be relatively common in dual-diagnosis patients. This study sought to examine prevalence and risk factors associated with psychotropic polypharmacy in hospitalized patients with MDD and co-occurring SUDs.

Methods: An electronic chart review was conducted with 1315 individuals admitted to a psychiatric hospital; 505 (38.4%) were identified as having co-occurring MDD + SUD. We examined psychotropic polypharmacy and clinical severity to explore risk for concerning drug interactions.

Results: Potentially problematic polypharmacy patterns were identified among those with MDD + SUD and were related to negative clinical outcomes, particularly in terms of increased sedation potential for individuals with an opioid use disorder (OUD). Groups at the highest risk for polypharmacy included patients who were female, older in age, lower in functioning, and presenting with a co-occurring OUD. Having an OUD was associated with particularly risky polypharmacy combinations, while having a cannabis use disorder was associated with the least polypharmacy.

Conclusions: Results highlight a high prevalence of polypharmacy among a group that has an elevated risk for negative outcomes. There is a continued need to improve identification of complex patient presentations and adjust medications in a hospital setting to improve treatment outcomes and reduce future mortality.