Objectives Adherence is critical for maximizing the effectiveness of preexposure prophylaxis (PrEP) in preventing HIV infection. Strategies for promoting adherence to HIV treatment, and their potential application to PrEP adherence, have received considerable attention. However, adherence promotion strategies for prevention medications have not been well characterized and may be more applicable to PrEP. We aimed to identify adherence support interventions that have been effective in other prevention fields and could be applied in the HIV prevention context to support pill taking among PrEP users. Methods To identify adherence support interventions that could be evaluated and applied in the PrEP context, we conducted a systematic review across the following prevention fields: hypertension, latent tuberculosis infection, hyperlipidemia, oral contraceptives, osteoporosis, malaria prophylaxis, and post-exposure prophylaxis for HIV infection. We included randomized controlled trials that evaluated the efficacy of interventions to improve adherence to daily oral medications prescribed for primary prevention in healthy individuals or for secondary prevention in asymptomatic individuals. Results Our searches identified 585 studies, of which 48 studies met the eligibility criteria and were included in the review; nine evaluated multiple strategies, yielding 64 separately tested interventions. Interventions with the strongest evidence for improving adherence included complex, resource-intensive interventions, which combined multiple adherence support approaches, and low-cost, low-intensity interventions that provided education or telephone calls for adherence support. Conclusions Our review identified adherence interventions with strong evidence of efficacy across prevention fields and provides recommendations for evaluating these interventions in upcoming PrEP studies.

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Women who have been in jail are at increased risk of acquiring HIV when they are in the community. Nonoccupational postexposure prophylaxis (nPEP) reduces HIV transmission following high-risk behaviors and is an effective HIV prevention strategy. The authors designed a 15-minute interactive educational program to increase inmates' knowledge of nPEP. Before the program, participants self-reported high HIV risk yet low risk perception and lack of nPEP awareness. After the program, nPEP knowledge scores increased by 40% regardless of demographic or HIV-risk characteristics. This study demonstrates that a brief, easy-to-deliver educational intervention can be carried out in a jail, is effective at raising awareness of both HIV risk and nPEP, and may be useful for others seeking to increase use of this prevention strategy for high-risk women during incarceration.