get medicines termed "nitrates" (which include nitroglycerin) use Avenue drugs known as "poppers" like amyl nitrate or amyl nitrite, and butyl nitrate get any medicines known as guanylate cyclase stimulators for example riociguat (Adempas) are allergic to sildenafil, as contained in Viagra® and Revatio, or any with the elements in Viagra®.Specifi