Safety and Pharmacokinetic Study of Dapivirine Gel (0.05%) Administered Rectally to HIV-1 Seronegative Adults

This study will evaluate the safety and pharmacokinetics (PK) of dapivirine gel (0.05%) administered rectally to HIV-1 seronegative adults. Participants will be randomized to receive a single dose of either rectally administered dapivirine gel (0.05%) or placebo gel at study entry (Day 0). Following a minimum 2-week washout period, participants or study staff will administer daily rectal doses of the assigned gel for 7 consecutive days under direct observation in the clinic. Participants will be in the study for approximately 40 days, and they will attend 16 study visits. Study visits may include behavioral assessments, physical examinations, blood and urine collection, and pelvic and anorectal sample collection. Some visits will include intensive PK sampling. Study staff will contact participants 1 week after Visit 16 for follow-up safety monitoring.