Does polypharmacy affect treatment outcomes of people living with HIV starting antiretroviral therapy?

Polypharmacy poses risks associated with drug-drug interactions, increased adverse effects, pill burden, poor compliance and unfavorable treatment outcomes. Whether polypharmacy affects treatment outcomes among people living with HIV (PLHIV) is largely unknown. A prospective study was conducted among PLHIV followed-up at a tertiary-care clinic of an academic medical center during January 2012 to December 2017. The clinic provided comprehensive HIV care with multidisciplinary team approach focusing on treatment adherence. Polypharmacy was defined as concurrent use of 5 or more non-antiretroviral (ARV) drugs for at least one year. Of the 248 PLHIV included, 23 (9%) received polypharmacy. PLHIV with polypharmacy were older (median age 45 vs. 36 years), were more likely to have underlying diseases (65% vs. 18%) and had lower median initial CD4 counts (40 vs. 214 cells/mm). The rates of virologic suppression at 12 months after ARV therapy were 96% and 92% in polypharmacy and non-polypharmacy groups, respectively (P = 0.70), while the median CD4 cell count increase was higher among the non-polypharmacy group at 12 months (207 vs. 403 cells/mm; P < 0.001). There were no differences in rates of adverse effects and experienced drug-drug interactions. Hospitalization due to HIV-related diseases within 12 months after ARV initiation [adjusted odds ratio (aOR) 11.63, P = 0.004] and lower 3-item score for ARV adherence (aOR 0.49, P = 0.01) were independently associated with failure of virologic suppression at 12 months. These findings suggest that polypharmacy did not affect the virological outcomes among our PLHIV. Patients with the characteristics associated with virological failure should be closely monitored.