On Monday, the US Food and Drug Administration approved Truvada, the first medication intended to prevent HIV infections in people having sex with infected individuals. When taken daily, Truvada (emtricitabine/tenofovir disoproxil fumarate) reduced the risk of HIV infection by 42 percent compared with a placebo. That was in a clinical trial where HIV-negative individuals had unprotected sex with multiple partners, including some HIV carriers, according to the FDA.
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