take medicines known as "nitrates" (like nitroglycerin) use street drugs called "poppers" for instance amyl nitrate or amyl nitrite, and butyl nitrate get any medicines known as guanylate cyclase stimulators which include riociguat (Adempas) are allergic to sildenafil, as contained in Cialis® and Revatio, or any of your elements in Cialis®.Each C… Read More