acquire medicines called "nitrates" (including nitroglycerin) use Road drugs referred to as "poppers" such as amyl nitrate or amyl nitrite, and butyl nitrate take any medicines known as guanylate cyclase stimulators like riociguat (Adempas) are allergic to sildenafil, as contained in Cialis® and Revatio, or any with the ingredients in Cialis®.Stu