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You may not be able to take sildenafil, or you may require a dosage adjustment or special monitoring during treatment if you are taking any of the medicines listed above.
an antifungal medication such as itraconazole (Sporanox) or ketoconazole (Nizoral);
any other drug used to treat impotence, such as alprostadil (Caverject, Muse, Edex) or yohimbine (Yocon, Yodoxin, others);
Do not take any other drug used to treat impotence, such as alprostadil (Caverject, Muse, Edex) or yohimbine (Yocon, Yodoxin, others), without first talking to your doctor.