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Viagra is a prescription drug used to treat erectile dysfunction. Learn about the drug s common, mild, and serious side effects and how to manage them. Sildenafil (Viagra) is taken by mouth to treat erectile dysfunction (ED).You take it only as needed, typically about an hour before sexual activity (but you can take it anywhere between 30 minutes to 4 hours before sex). viagra delivery today Viagra: The original ED medication. Cancel anytime subscriptions. Consult an expert online. Quick delivery. US pharmacy. See more Sildenafil (Viagra) is a medicine used to treat erectile dysfunction (ED, also called impotence). Sildenafil works by helping to relax the blood vessels in the penis, allowing more blood to flow in and cause an erection.