We want to learn more about Post-Exposure Prophylaxis (PEP). PEP involves taking medication to protect yourself from contracting HIV after a possible exposure—sex without a condom, condom slips and breaks, shared needles, sexual assault. PEP needs to be started within 72 hours of exposure. Fenway Health is conducting a study to learn more about PEP. To learn more, call our PEP Hotline at 617.840.5326. You can also access PEP at your nearest emergency room.