get medicines referred to as "nitrates" (like nitroglycerin) use Avenue drugs called "poppers" including amyl nitrate or amyl nitrite, and butyl nitrate consider 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 substances in Cialis®.Usua