PrEP is short for Pre-Exposure Prophylaxis. PrEP is a way for people who don't have HIV to prevent HIV infection by taking a pill every day. The pill contains two medicines that are also used to treat HIV. If someone takes PrEP and is exposed to HIV through sex or injection drug use, these medicines can work to keep the virus from taking hold in their body. When taken every day, PrEP is safe and highly effective in preventing HIV infection. PrEP is even more effective if it is combined with other ways to prevent new HIV infections like condom use, drug abuse treatment, and treatment for people living with HIV to reduce the chance of passing the virus to others.