Truvada is a prescription medication that contains two active ingredients: emtricitabine and tenofovir disoproxil fumarate . It belongs to a class of drugs called nucleoside reverse transcriptase inhibitors (NRTIs) . It is used for two main purposes: To treat HIV infection (always in combination with other antiretroviral medications) . For HIV PrEP (Pre-Exposure Prophylaxis) to reduce the risk of getting HIV in people who