Post-Exposure Prophylaxis - usually called PEP- is an emergency method of preventing HIV that can be used after a potential risk for HIV. Taking PEP after a potentially risky sexual encounter can stop HIV from taking hold in your body. Taking ‘PEP’ is different to taking ‘PrEP’ (see below). PEP is a 28-day course of anti-HIV medication. The sooner after a possible exposure you start taking PEP the better, but it must be started within 72 hours (3 days). PEP is available from most hospital Emergency Departments and some sexual health clinics.
Understanding your vulnerability to HIV
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