Adverse reactions from clinical study experience with efavirenz + emtricitabine + tenofovir disoproxil fumarate The following data are derived from a clinical study (GS-01-934) in which efavirenz, emtricitabine and tenofovir disoproxil fumarate were co-administered without regard to food as individual formulations or as a dual fixed combination of emtricitabine and tenofovir disoproxil fumarate with efavirenz.