Outpatient Psychotropic Drug Interactions in a Public Psychiatry Hospital in Bahrain: An Audit Study

Background: Psychotropic polypharmacy is particularly common, which puts psychiatric patients at high risk for developing drug-drug interactions. Objective: We aimed to study potential interactions between psychotropic medications prescribed within the outpatient psychiatry setting. Methods: This was an audit study, which targeted a sample of outpatient prescriptions ordered within the outpatient clinics of the main psychiatry hospital in Bahrain over 2017. We studied the grades and correlates of interactions between psychotropic drugs. Results: The total number of prescriptions in our sample was 992 (56.1% males, 43.9% females). Psychotropic polypharmacy was detected in 842 prescriptions (84.9%). Potential interactions between psychotropic drugs were observed in 550 prescriptions (56.4%). The degree of interaction was minor in 43 prescriptions (7.8%), significant in 419 prescriptions (76.2%), and serious in 88 prescriptions (16%). Schizoaffective disorder subjects were the most likely to suffer from interactions (64.6%), whereas prescriptions issued for those who had schizophrenia contained the least number of interactions (51.6%). The total number of interactions was strongly associated with polypharmacy (p < .001) and gender (p < .01), but not with age (p > .05) or diagnosis (p > .05). Conclusion: High prevalence of polypharmacy and interactions between psychotropic medications were observed in our sample, particularly of the significant grade.