choose medicines called "nitrates" (like nitroglycerin) use Avenue drugs known as "poppers" such as amyl nitrate or amyl nitrite, and butyl nitrate choose any medicines identified as guanylate cyclase stimulators such as riociguat (Adempas) are allergic to sildenafil, as contained in Cialis® and Revatio, or any with the elements in Cialis®.Alcuni