take medicines known as "nitrates" (like nitroglycerin) use street drugs called "poppers" including amyl nitrate or amyl nitrite, and butyl nitrate get any medicines termed guanylate cyclase stimulators like riociguat (Adempas) are allergic to sildenafil, as contained in Cialis® and Revatio, or any with the ingredients in Cialis®.Cialis dosage is