This is a phase 1, open-label (all people know the identity of the intervention), randomized (study medication is assigned by chance), parallel-group, sequential study in healthy adult participants to characterize the single-dose pharmacokinetics (PK) of rilpivirine (RPV) after intramuscular (IM) injection of RPV LA nanosuspensions with different particle size distributions (PSD), in healthy adult participants. A total of 110 healthy adult participants will be enrolled in this study. The study will consist of 2 treatment sessions in a fixed sequential order: Session 1- all participants will receive a single oral dose of rilpivirine 25 milligram (mg) as oral immediate release solution on Day 1; Session 2- the participants will be randomized in session 2 on Day 1 in a 1:1:1:1:1 ratio to Treatments A, B, C, D and E. Each treatment group will receive a single IM injection of RPV LA on Day 1 of session 2. Session 1 and 2 will be separated by a washout period of at least 14 days. The total study duration for each participant will be approximately 9.5 months. Safety will be monitored throughout the study.
The main purpose of this study is to characterize the single-dose pharmacokinetics (PK) of rilpivirine (RPV) after intramuscular (IM) injection of rilpivirine long-acting parenteral formulation (RPV LA) nanosuspensions with different particle size distribution (PSD), in healthy adult participants.