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take medicines named "nitrates" (like nitroglycerin) use Road medicines identified as "poppers" like amyl nitrate or amyl nitrite, and butyl nitrate choose any medicines called guanylate cyclase stimulators for example riociguat (Adempas) are allergic to sildenafil, as contained in Viagra® and Revatio, or any from the elements in Viagra®.Inquire