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More powerful CYP3A4 inhibitors like ketoconazole or itraconazole might be anticipated to possess better results than witnessed with saquinavir. A starting up dose of twenty five mg of VIAGRA need to be regarded as in clients getting erythromycin or solid CYP3A4 inhibitors (like saquinavir, ketoconazole, itraconazole) [see DOSAGE AND ADMINISTRATION