Seventeen countries are hosting sites for the Phase 3 efficacy trials of a monthly PrEP pill, MK-8527, being developed by Merck (also known as MSD outside of the US and Canada). Merck announced the launch of the Phase 3 trials at IAS 2025 in Kigali. MK-8527 was found to be safe and well-tolerated in Phase 2 clinical trials.
EXPrESSIVE Phase 3 Trials Countries of MK-8527
Lenacapavir Implementation Studies
Ongoing and planned implementation studies for the lenacapavir as of October 2025. For product approvals, volumes, implementation, and price comparisons of long-acting PrEP, visit our dashboard on PrEPWatch.org.
Long-Acting PrEP: Priority Slides
Slides with the current status and proposed priorities for long-acting PrEP products, regulatory approvals, planning & budgeting, delivery, and much more. PDF and PPT versions available above. For slide 1, current status, click here. Slide 2, proposed priorities, is also available.
For product approvals, volumes, implementation, and price comparisons of long-acting PrEP, visit our dashboard on PrEPWatch.org.
Cabotegravir Implementation
Implementation studies completed, ongoing, or planned for cabotegravir as of October 2025. For product approvals, volumes, implementation, and price comparisons of long-acting PrEP, visit our dashboard on PrEPWatch.org.
Dapivirine Vaginal Ring Implementation
Ongoing and planned implementation studies for the dapivirine vaginal ring as of October 2025. For product approvals, volumes, implementation, and price comparisons of long-acting PrEP, visit our dashboard on PrEPWatch.org.
Cabotegravir Volume
Allocation of non-commercial cabotegravir for PrEP supply in low- and middle-income countries, 2023-2026, as of October 2025. For product approvals, volumes, implementation, and price comparisons of long-acting PrEP, visit our dashboard on PrEPWatch.org.
Dapivirine Vaginal Ring Volume
DVR supply available to low- and middle-income countries as of October 2025. For product approvals, volumes, implementation, and price comparisons of long-acting PrEP, visit our dashboard on PrEPWatch.org.
Cabotegravir Regulatory Approval
Regulatory approvals and those pending for cabotegravir as of October 2025. For product approvals, volumes, implementation, and price comparisons of long-acting PrEP, visit our dashboard on PrEPWatch.org.
Dapivirine Vaginal Ring Regulatory Approval
Regulatory approvals, pending decisions, and appeals as of October 2025. For product approvals, volumes, implementation, and price comparisons of long-acting PrEP, visit our dashboard on PrEPWatch.org.
HIV Prevention Product Overview
The graphic provides an overview of PrEP products currently available and in late-stage clinical trials.