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 relaxes muscles found in the walls of blood vessels and increases blood flow to particular areas of the body. Viagra is used to treat erectile dysfunction (impotence) in men. Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in men. It is also used to treat pulmonary arterial hypertension, a serious heart and lung condition. This drug is more popular than comparable drugs. It is available in generic and brand versions. 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 belongs to a group of drugs called phosphodiesterase 5 (PDE5) inhibitors. This article describes the dosage of Viagra, as well as its strengths and how to take it. Viagra (sildenafil) is a brand-name prescription drug that’s used to treat erectile dysfunction (ED). Learn about side effects, warnings, dosage, and more. Viagra is a prescription medicine used to treat the symptoms of erectile dysfunction. Learning about dosages, side effects, drug interactions, warnings, and more. Viagra 50mg Tablet is a prescription medicine used to treat erectile dysfunction (impotence) in men. It works by increasing blood flow to the penis. This helps men to get or maintain an erection. It belongs to a group of medicines known as phosphodiesterase type 5 (PDE 5) inhibitors. Sildenafil is used to treat erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. VIAGRA contains sildenafil, which is the same medicine found in another drug called REVATIO. REVATIO is used to treat a rare disease called pulmonary arterial hypertension (PAH).