just take medicines termed "nitrates" (like nitroglycerin) use Road drugs known as "poppers" such as amyl nitrate or amyl nitrite, and butyl nitrate acquire any medicines termed guanylate cyclase stimulators like riociguat (Adempas) are allergic to sildenafil, as contained in Viagra® and Revatio, or any on the elements in Viagra®.Created by @agne