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Pre-exposure prophylaxis (PrEP) is the use of medications used to prevent the spread of disease in people who have not yet been exposed to a disease-causing agent, usually a virus. The term typically refers to the specific use of antiviral drugs as a strategy for HIV/AIDS prevention. PrEP is one of a number of HIV prevention strategies for people who are HIV negative but who also have a higher risk of acquiring HIV, including sexually active adults at increased risk of HIV, people who engage in injection drug use (see drug injection), and serodiscordant sexually active couples.