Recent Alcohol Use Is Associated with Increased Pre-exposure Prophylaxis (PrEP) Continuation and Adherence among Pregnant and Postpartum Women in South Africa

Background:South African women experience high levels of alcohol use and HIV infection during the perinatal period. Oral pre-exposure prophylaxis (PrEP) is highly effective at reducing HIV risk. We examined associations between alcohol use and PrEP use during pregnancy and postpartum.Methods:The PrEP in Pregnant and Postpartum women study is a prospective observational cohort of 1200 HIV-negative pregnant women enrolled at first antenatal care visit and followed through 12 months' postpartum in Cape Town, South Africa. The analytic sample comprised pregnant women who initiated PrEP at baseline and were not censored from study follow-up before 3-month follow-up. We examined associations between any or hazardous alcohol use (Alcohol Use Disorders Identification Test - Consumption score ≥3) in the year before pregnancy and PrEP continuation and adherence during pregnancy (self-report of missing <2 doses in past 7 days and biomarker-confirmed with tenofovir diphosphate in dried blood spots).Results:Of 943 women on PrEP (median age of 26 years), 50% reported alcohol use before pregnancy, and 33% reported hazardous use. At 3-month follow-up, 58% of women were still using PrEP; 41% reported recent adherence, and 23% were biomarker-confirmed adherent. In multivariable models, hazardous alcohol use was associated with increased odds of continuing PrEP [adjusted odds ratio (aOR) = 1.54, 95% confidence interval (CI): 1.16-2.06], self-reported PrEP adherence (aOR = 1.41, 95% CI: 1.07-1.87), and biomarker-confirmed PrEP adherence (aOR = 1.35 95% CI: 0.98, 1.87). Associations were similar in models of any alcohol use and PrEP continuation/adherence.Conclusions:Pregnant and postpartum women who reported recent alcohol use had increased odds of continuing to take PrEP, indicating that higher risk women may continue on oral PrEP.