choose medicines called "nitrates" (which include nitroglycerin) use street drugs termed "poppers" including amyl nitrate or amyl nitrite, and butyl nitrate get any medicines called guanylate cyclase stimulators like riociguat (Adempas) are allergic to sildenafil, as contained in Cialis® and Revatio, or any of the substances in Cialis®.Tadalafil