HPTN 102/PURPOSE 3

This is a Phase 2, open-label, multicenter, randomized study to evaluate the PK, safety, and acceptability of LEN subcutaneous (SC) injection compared with oral F/TDF in cisgender women who would benefit from PrEP. This study has 2 parts. Randomized Phase: ppts will be randomized in a 1:1 ratio to receive 52 wks of LEN or F/TDF, followed by up to 78 wks of F/TDF for both study drug groups in the PK Tail Phase. Participants in the LEN group will transition to F/TDF for the PK Tail Phase.