In this Phase I , open-label , randomized , three-panel , crossover study ( NCT@ ) , healthy volunteers received a single dose of darunavir ( @ mg ) with cobicistat ( @ mg ) as either an FDC or as single agents co-administered under fasted ( panel @ , n = @ ) or fed ( breakfast , panel @ , n = @ ) conditions , or as the FDC under fasted versus fed ( high-fat breakfast ) conditions ( panel @ , n = @ ) , with a @ day washout period between treatments .