get medicines termed "nitrates" (which include nitroglycerin) use Road medication named "poppers" like amyl nitrate or amyl nitrite, and butyl nitrate get any medicines called guanylate cyclase stimulators including riociguat (Adempas) are allergic to sildenafil, as contained in Viagra® and Revatio, or any of the substances in Viagra®.Two-12 mont