WASHINGTON – Since 2012, Americans at risk of HIV-1 infection from sex have had just a single option for reducing their odds of acquiring it: a daily dose of Gilead Sciences Inc.'s Truvada (emtricitabine and tenofovir disoproxil fumarate). Now, about a year before Truvada goes generic, at least some of them have a second option in Gilead's Descovy (emtricitabine and tenofovir alafenamide). On Thursday, the FDA approved Descovy for HIV-1 pre-exposure prophylaxis, or PrEP, to reduce the risk of HIV-1 infection from sex, excluding those who have receptive vaginal sex.