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You need to beware with taking any of the complying with medications and incorporating them with Sildenafil: anticoagulants, efavirenz, rifampin, hypertension medicines, rifabutin, various other impotence treatment drugs, antifungals, 'beta' blockers, HIV protease preventions, erythromycin, seizure medicines, barbiturates, amlodipine, alpha blockers, cimetidine and a few other ones.