How Effective Is PEP at Preventing HIV? How Well It Works, and How Quickly to Start
PEP, or emergency antiretroviral medicine, is highly effective at reducing the risk of HIV when started quickly within 72 hours after a risk and taken for the full 28 days as advised. The sooner you start, the better. This guide explains how well PEP works, factors that make it effective, why you must start quickly, and what to do after completing it.