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More robust CYP3A4 inhibitors which include ketoconazole or itraconazole might be envisioned to own higher results than viewed with saquinavir. A commencing dose of twenty five mg of VIAGRA should be deemed in sufferers using erythromycin or sturdy CYP3A4 inhibitors (for instance saquinavir, ketoconazole, itraconazole) [see DOSAGE AND ADMINISTRATIO