Suboptimal uptake, retention, and adherence of daily oral PrEP among people with OUD receiving HCV treatment

Abstract

Abstract Introduction Daily oral pre-exposure prophylaxis (PrEP) with tenofovir/emtricitabine (TDF/FTC) prevents HIV among people who inject drugs (PWID). Despite rising HIV incidence and injection drug use, PrEP use remains low and there is limited research about uptake, adherence, and retention among PWID. Methods The ANCHOR investigation evaluated a community-based care model collocating hepatitis C (HCV) treatment, medication for opioid use disorder (OUD), and PrEP in individuals in Washington, DC-Baltimore. PrEP counseling was conducted from HCV treatment Day 0 until Week 24. Subjects could start any time during this window, were followed for 48 weeks, and were assessed for adherence by self-report and dried bloodspot TDF analysis. Results 198 participants were enrolled, of whom 185 (93%) were HIV-negative. Twenty-nine individuals (15.7% of HIV-negative cohort) initiated PrEP. 116 participants (62.7%) met 2014 CDC PrEP criteria due to IDU (82, 44.3%), sex (9, 4.9%), or both practices (25, 13.5%). Providers recommended PrEP to 94 individuals (50.8%), and recommendation was associated with PrEP uptake. Median treatment duration was 104 days (IQR 28, 276), with 8 participants retained through Week 48. Adherence was variable over time by self-report and declined by TDF analysis. No HIV seroconversions occurred. Conclusions This cohort of people with HCV and OUD experienced low uptake of PrEP despite the majority meeting CDC criteria. High rates of disruption and discontinuation, compounded by variable adherence, made TDF/FTC a suboptimal prevention strategy. Emerging modalities like long-acting formulations may address these barriers, but PWID have been excluded from their development to date.