Take medicines named "nitrates" (such as nitroglycerin) use Road medication named "poppers" for example amyl nitrate or amyl nitrite, and butyl nitrate take any medicines known as guanylate cyclase stimulators including riociguat (Adempas) are allergic to sildenafil, as contained in Viagra® and Revatio, or any from the substances in Viagra®. https://www.facebook.com/RevitalizedRays