Poor Oral HIV Pre-Exposure Prophylaxis (PrEP) Persistence in an Integrated PrEP/STI Program in Malawi

The integration of HIV pre-exposure prophylaxis (PrEP) into STI services can improve PrEP uptake among a population at elevated risk of acquiring HIV. The effectiveness of PrEP relies on ongoing coverage during periods of HIV risk, however, and little is known about longitudinal PrEP use among people accessing PrEP through STI clinics in sub-Saharan Africa. In this study, we analyzed routine records data from people who newly initiated PrEP at an STI clinic in Lilongwe, Malawi in March-December 2022. We assessed PrEP persistence among clients who received Malawi's standard-of-care PrEP services (n = 662) and reweighted the data to reflect the baseline distribution of age, sex, and PrEP indication among the full study population (n = 835). We used weighted generalized estimating equations to estimate the proportion of clients expected to persist on PrEP if all clients had received Malawi's standard-of-care services. We also assessed predictors of persistence and described re-engagement in PrEP among clients who did not persist. We estimated that, had all clients received standard-of-care services, 17% (95% CI: 14%, 20%), 7% (95% CI: 6%, 10%), and 4% (95% CI: 3%, 5%) would have persisted on PrEP at 1, 3, and 6 months, respectively, and that 8% (95% CI: 5%, 11%) of those who did not persist on PrEP at 1 month would have re-engaged in PrEP services by 12 months. Persistence varied by age and PrEP indication. Our findings indicate very low PrEP persistence in this population and suggest opportunities to support ongoing PrEP use in settings with integrated PrEP/STI services.