get medicines called "nitrates" (such as nitroglycerin) use Avenue drugs named "poppers" which include amyl nitrate or amyl nitrite, and butyl nitrate just take any medicines termed guanylate cyclase stimulators like riociguat (Adempas) are allergic to sildenafil, as contained in Cialis® and Revatio, or any on the substances in Cialis®.Studi in a