PrEP is a pill, which is used for preventing HIV. The FDA approved PrEP in 2012.
Pre-exposure prophylaxis (or PrEP) stops HIV from spreading throughout the body. Daily PrEP reduces the risk of getting HIV from sex. Risk of getting HIV from sex can be even lower if you combine PrEP with condoms and other prevention methods.
PrEP is to be taken by people who do not have HIV, but who are at very high risk for getting it from ongoing sexual relationship with an HIV-positive partner or injection drug use.
PrEP can cause side effects like nausea in some people. Tell your health care provider about any side effects that are severe or do not go away.
If someone thinks that he is exposed to HIV, PEP (post-exposure prophylaxis) is an option where antiretroviral medicines are given to prevent becoming infected. It is given within 72 hours of exposure to HIV.
PrEP Locator (https://npin.cdc.gov/preplocator)