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Permit your medical professional understand if you are thinking of taking 'beta' blockers, HIV protease inhibitors, amlodipine, barbiturates, seizure medicines, rifabutin, nevirapine, bosentan, alpha blockers, cimetidine, medications for hypertension, other erectile dysfunction meds, particular antifungals, rifampin, efavirenz, anticoagulants, or erythromycin, as you could be advised to do without taking either of the drugs, or a lower dosage may be essential.