Background: Achieving optimal adherence, referred to as ≥95%, is crucial for the success of antiretroviral therapy (ART) to maintain viral suppression among people living with HIV (PLHIV). Objectives: To assess level of adherence to ART in adult PLHIV in Ikorodu General Hospital, Lagos, Nigeria. Methods: A cross-sectional study in 340 PLHIV ≥18 years using questionnaires to assess knowledge of HIV, ART, adherence, and its barriers. Adherence measures were done with a 4-day self-reported AIDS clinical trial group (ACTG) tool and retrospective pharmacy refill record. Data were analysed using SPSS version 23.0. Good knowledge is a percentage score of ≥ 70. The level of significance was set at p < 0.05. Results: A total of 227 (females 66.8%) with mean age of 42.3±11.3 years were assessed. Poor knowledge of HIV (66.8%), ART (64.9%), and adherence to ART (52.3%) was demonstrated by the respondents. Mean self-reported adherence was 92.78%, while pharmacy refill adherence was 90.91%. Overall, 84.1% achieved viral suppression, with a significant negative correlation between adherence to ART and viral load (R=-0.293, p= 0.035). Waiting time to see caregivers for treatment (Odds ratio (OR): 0.919; 95% confidence interval (CI): 0.745-1.135, p= 0.045), reasons for forgetting to take medicines (OR: 1.135; 95% CI: 0.985-1.308, p= 0.039), and how satisfied patients were with the current ARV regimen (OR: 1.868; 95% CI: 1.040-3.358, p= 0.037) were significant predictors to ART adherence. Conclusion: The sub-optimal self-reported and pharmacy refill adherence rates at the facility shows a need for adherence support interventions for PLHIV on ART.
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