A Pilot Study of a Sibling-Based Online Intervention to Increase PrEP Uptake and Willingness Among Latino MSM

This study explored the feasibility and acceptability of Entre Herman@s, a novel sibling-based intervention designed to engage siblings to increase PrEP utilization among Latino men who have sex with men (LMSM). Siblings were trained in rudimentary motivational interviewing skills to uncover, evoke, and strengthen their brother's motivation to use PrEP, using the constructs of the Information-Motivation-Behavioral Skills (IMB) model for health behavior change. This pilot demonstrated high feasibility, meeting recruitment, retention, and intervention completion targets. Of the 23 LMSM enrolled, 16 (70%) commenced PrEP, with 12 (75%) continuing at the 3-month follow-up. Initially, 15 participants (65%) were open to PrEP, with 9 (39%) ready to start within the next month. Those who began PrEP use reported a significantly higher degree of closeness to their siblings (<i>p</i> = .019) than those who did not. All LMSMs affirmed that their decision to use PrEP was influenced to some degree by their sibling.