Accidents Happen.
HIV Doesn't Have To.

Post-exposure prophylaxis (PEP) is a daily pill regimen taken for 28 days that prevents HIV infection after coming into contact with HIV. Much like emergency contraception is taken to prevent pregnancy, PEP is an emergency medicine that can stop HIV infection if taken as soon as possible.

It must be taken within 72 hours after potential exposure to HIV. It reduces your risk of contracting HIV by 80 percent. 

PEP is for HIV-negative people who may have been exposed to HIV through sex in the last 72 hours. For example, sex without a condom or sex during which the condom broke. 

PEP can also help if you were a victim of sexual assault or exposed to HIV due to intravenous drug use. It must be taken within 72 hours after contact with HIV.

There can be side effects of PEP, like stomach aches and feeling tired. But PEP side effects aren’t dangerous, and they can be treated. Talk with your nurse or doctor if you have side effects that are really bothering you.

If PEP doesn’t work, you may have symptoms of the first stage of an HIV infection, like a fever or rash. If you have these symptoms while you’re on PEP, or within a month after finishing PEP, call your nurse or doctor.