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consider medicines referred to as "nitrates" (such as nitroglycerin) use street drugs called "poppers" such as amyl nitrate or amyl nitrite, and butyl nitrate consider any medicines named guanylate cyclase stimulators for instance riociguat (Adempas) are allergic to sildenafil, as contained in Viagra® and Revatio, or any of the elements in ViagraÂ