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