TRUVADA is approved for pre-exposure prophylaxis (PrEP) to reduce the risk of sexually acquired HIV in adults at high risk. Clinical trials showed that PrEP reduced the risk of HIV infection by 44-92% in men who have sex with men and 75-90% in heterosexual couples where one partner had HIV. However, PrEP was only effective if taken consistently as prescribed. TRUVADA must be used as part of a comprehensive prevention strategy including condom use, knowledge of HIV status, and regular testing for HIV and STIs. Important safety information and drug interactions are provided. Resources for patients and providers on PrEP are listed.