The Food and Drug Administration has approved the first drug intended to prevent HIV infection. Truvada is now approved for those at high risk of becoming infected with the virus that leads to AIDS. It's already used as a treatment for HIV positive adults in combination with other drugs. The FDA says truvada should be used along with condoms for those likely to be sexually active with HIV infected people. Studies have shown the drug can cut the risk of infection by 44-percent in gay or bisexual men and by 75-percent in heterosexual couples where one person is HIV positive. However, experts stressed that truvada is only effective when taken every day. Drug maker Gilead is expected to continue collecting safety data.
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