choose medicines identified as "nitrates" (such as nitroglycerin) use street drugs called "poppers" like amyl nitrate or amyl nitrite, and butyl nitrate take any medicines known as guanylate cyclase stimulators such as riociguat (Adempas) are allergic to sildenafil, as contained in Cialis® and Revatio, or any of the elements in Cialis®.Non è not