In a cross-over study in 22 HIV-infected patients treated with Invirase/ritonavir 1000 mg/100 mg twice daily and receiving three consecutive doses under fasting conditions or after a high-fat, high-calorie meal (46 g fat, 1,091 Kcal), the AUC0-12, Cmax and Ctrough values of saquinavir under fasting conditions were about 70 per cent lower than with a high-fat meal.