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Much better CYP3A4 inhibitors such as ketoconazole or itraconazole could possibly be expected to have greater outcomes than seen with saquinavir. A starting up dose of 25 mg of VIAGRA needs to be viewed as in patients taking erythromycin or powerful CYP3A4 inhibitors (including saquinavir, ketoconazole, itraconazole) [see DOSAGE AND ADMINISTRATION,