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take medicines known as "nitrates" (like nitroglycerin) use street prescription drugs known as "poppers" like amyl nitrate or amyl nitrite, and butyl nitrate choose any medicines named guanylate cyclase stimulators like riociguat (Adempas) are allergic to sildenafil, as contained in Cialis® and Revatio, or any of the substances in Cialis®.The sci