Learn about sildenafil (Viagra) usage and dosing. Read the latest news and reviews about the drug as well as potential side effects and popular alternatives. Sildenafil Tablets (Erectile Dysfunction) Sildenafil is a treatment for erectile dysfunction. It works by increasing blood flow to your penis. This helps maintain an erection. The brand name for this medication is Viagra®. Find patient medical information for Sildenafil (Viagra, Revatio) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Viagra (sildenafil) is a brand-name prescription drug that’s used to treat erectile dysfunction (ED). Learn about side effects, warnings, dosage, and more. Sildenafil is used to treat erectile dysfunction in adult men or pulmonary arterial hypertension in adults and children, depending on the brand or formulation. Includes sildenafil side effects, interactions, and indications. Viagra (sildenafil) is a prescription medication that treats erectile dysfunction (ED). Viagra is an oral medication. It’s available as 25 mg, 50 mg, and 100 mg tablets. You can take a dose about 1 hour before sexual activity. Viagra is available as a lower-cost generic. Sildenafil, generic for Viagra, is an oral prescription medication used to treat male sexual dysfunction, also known as impotence or erectile dysfunction (ED). It is a tablet taken prior to sexual activity no more than once every 24 hours. Viagra (sildenafil) is used to treat erectile dysfunction or impotence in men. Includes Viagra side effects, interactions and indications. Information about the drug sildenafil (Viagra) prescribed for the treatment of impotence (erectile dysfunction, ED) and pulmonary arterial hypertension. Side effects, drug interactions, and dosing information is included. Sildenafil is used to treat erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors.