Assessing the Acceptability of a Tenofovir-Based Rectal Microbicide Douche among Young Men who Have Sex with Men: Results from ATN-DREAM (ATN 163).

Young men who have sex with men (YMSM) remain disproportionately affected by HIV, yet adherence to daily oral pre-exposure prophylaxis (PrEP) remains suboptimal. Rectal microbicides formulated as douches offer a behaviorally congruent alternative by leveraging existing douching practices. This study assessed the acceptability of a tenofovir-based rectal microbicide douche among YMSM. Eight YMSM (M = 20.9 years; range 18-24 years) participated in a Phase I, open-label, single-arm trial evaluating the safety, pharmacokinetics, and tolerability of a single 600 mg dose of tenofovir delivered in a 125mL rectal douche (NCT04686279). This mixed-methods study included post-dosing behavioral surveys and qualitative in-depth interviews (IDIs) to assess acceptability, tolerability, and perceptions of the product's usability. Interviews were transcribed, coded, and analyzed thematically. Descriptive statistics summarized participant characteristics, douching behaviors, and willingness to use the product in different contexts. Participants reported high acceptability of the rectal microbicide douche, particularly its ease of use and integration into existing sexual health routines. Most (87.5%) indicated they would find the product acceptable for HIV prevention, and 75% reported they would likely use it before every receptive anal intercourse (RAI) event. The episodic dosing regimen was perceived as a benefit, especially for casual sexual encounters. Barriers included product design concerns, privacy, and cost. A rectal microbicide douche was highly acceptable among YMSM, supporting its potential as a novel HIV prevention strategy. Findings underscore the importance of behaviorally congruent interventions and highlight key considerations for future product development, including improved packaging, affordability, and accessibility.Trials Registration: NCT04686279.