Pre-exposure prophylaxis for HIV prevention, commonly known as PrEP, is the use of antiviral drugs as a strategy for the prevention of HIV/AIDS by people that do not have HIV/AIDS. PrEP is one of a number of HIV prevention strategies for people who are HIV-negative but who have a higher risk of acquiring HIV, including sexually active adults who are at increased risk of contracting HIV, people who engage in intravenous drug use, and serodiscordant sexually active couples.