Saquinavir (Ro 31-8959) is a potent HIV protease inhibitor, is an antiretroviral drug used together with other medications to treat or prevent HIV/AIDS.

After an overnight fast, eight healthy volunteers were treated with either 400 ml grapefruit juice or water before intravenous (12 mg) or oral saquinavir (600 mg) was administered.?Serial blood samples were obtained over the following 24 h and standardized meals were served 5 and 10 h after the administration of saquinavir.?The plasma concentrations of saquinavir were determined by high-performance liquid chromatography and pharmacokinetic parameters were calculated by routine methods[1].