acquire medicines termed "nitrates" (which include nitroglycerin) use street drugs known as "poppers" like amyl nitrate or amyl nitrite, and butyl nitrate get any medicines known as guanylate cyclase stimulators like riociguat (Adempas) are allergic to sildenafil, as contained in Cialis® and Revatio, or any in the ingredients in Cialis®.La dosis