On Monday, the FDA approved Truvada, the first medication intended to prevent HIV infections in people having sex with infected partners. In clinical trials where HIV-negative individuals had unprotected sex with multiple partners, including some with HIV, the pill reduced the risk of infection by 42 percent compared with a placebo. Another trial with heterosexual couples where one partner was infected found that Truvada, which is taken daily, reduced the risk by 75 percent. The FDA warned that the drug, which will cost patients about $450 a year, should be used in conjunction with other prevention methods.
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