Factors Associated with Retention and Adherence in a Comprehensive, Diverse HIV Pre-Exposure Prophylaxis Clinic

Retention in HIV pre-exposure prophylaxis (PrEP) care and adherence to PrEP have been suboptimal in some populations, despite evidence that high adherence dramatically enhances PrEP efficacy. A comprehensive PrEP Clinic with a retention specialist and clinical pharmacist could impact patient's retention and adherence in PrEP care. A retrospective electronic medical record review of patients attending an academic PrEP Clinic was conducted between June 2018 and June 2019 (at least one visit attended for PrEP was required). Retention was defined as a medical or laboratory visit every 3 months ±30 days, as recommended by CDC guidelines, but was analyzed using the number of visits and time between visits via multivariate regression analyses. PrEP adherence was calculated using a Medication-Possession Ratio (MPR) and compared between patient characteristics using Kruskal-Wallis tests. One hundred twenty-two patients were identified by chart review, 96 had sufficient data for follow-up and were included in at least one analysis. The population was primarily cisgender men who have sex with men and over half were African American or Hispanic. Overall, patient retention was 43%. The retention analysis demonstrated that individuals who self-identified as gay were more likely to be retained than those who identified as heterosexual (53% vs. 18%, hazard ratio = 1.75, 95% confidence interval = [1.01-3.03], p = .045). Although not statistically significant, African Americans and cisgender women were less likely to be retained in care. The adherence analysis identified higher median MPRs among patients not reporting previous incarceration (80% vs. 35%, p < .01). Although not statistically significant, there was lower adherence among youth 18-24 (11% vs. 54% MPR >80, p = .058). Despite comprehensive PrEP clinical care, heterosexual individuals were less likely to be retained in PrEP care than those who self-identified as gay and previously incarcerated individuals were less likely to be adherent to PrEP.