PEP is a way to help prevent the transmission of HIV in an HIV-negative person who may have been recently exposed to the virus. It involves taking HIV medications as soon as possible after a potential exposure to HIV. Anyone who thinks they may have been exposed to HIV should contact their doctor, a hospital emergency room or sexual health clinic immediately to see if they offer PEP.
PEP is very effective but will not prevent 100% of HIV transmissions from occurring. It must be started within 72 hours of exposure to HIV. For PEP to be effective, a person must have high adherence to the full course of PEP drugs and should have no further exposures to HIV while taking PEP. Learn more about PEP:pep-brochure-04222021-en