Gilead Sciences entered into an agreement with Tibotec Pharmaceuticals for the development and commercialization of a new once-daily fixed-dose antiretroviral regimen containing Gilead's Truvada® (emtricitabine and tenofovir disoproxil fumarate) and Tibotec's investigational non-nucleoside reverse transcriptase inhibitor (NNRTI) TMC 278 (rilpivirine hydrochloride).