Post-Exposure Prophylaxis (PEP) (Last updated 8/30/2016; last reviewed 8/30/2016) Key Points Post-exposure prophylaxis (PEP) involves taking antiretroviral (ARV) medicines very soon after a possible exposure to HIV to prevent becoming infected with HIV. PEP should be started as soon as possible to be effective and always within 72 hours (3 […]

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