This photo provided by Gilead Sciences shows Truvada. (AP Photo/Gilead Sciences)
The agency approved Gilead Sciences' pill Truvada as a preventive measure for people who are at high risk of acquiring HIV, such as those who have sex with HIV-infected partners.
Gilead Sciences Inc. has marketed Truvada since 2004 as a treatment for people who are infected with the virus.
But company studies have shown the drug can prevent people from contracting HIV when used as a precautionary measure. A three-year study found that daily doses cut the risk of infection in healthy gay and bisexual men by 42 percent, when accompanied by condoms and counseling.
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