Prep stands for pre-exposure prophylaxis, which is a medicine taken to prevent getting HIV. It is for people who dont already have HIV but are at risk of getting it. PrEP can reduce the risk of getting HIV from sex by about 99% when taken as prescribed. It is highly effective for preventing HIV when taken as prescribed. PrEP can either be a pill that you take every day or an injection that you get every two months. PrEP is much less effective when not taken as prescribed. Since PrEP only protects against HIV, condom use is still important for the protection against other STDs. PrEP is less effective when it isnt taken consistently. Anyone who is sexually active and doesnt have HIV can use PrEP. To find out if PrEP is right for you, talk to your healthcare provider.