Learn about the dosages of Viagra for treating erectile dysfunction (ED). You can also find information on the drug’s strengths, form, and more. Viagra is an FDA-approved prescription pill for erectile dysfunction. This medication works by improving blood flow to your penis when you’re sexually aroused. Viagra (sildenafil) is a brand-name prescription drug that’s used to treat erectile dysfunction (ED). Learn about side effects, warnings, dosage, and more. Compare generic Viagra (sildenafil) prices from accredited international online pharmacies, U.S. mail-order pharmacies, and discount coupon programs. The lowest available price for generic Viagra (sildenafil) 100 mg is $0.31 per tablet for 88 tablets at PharmacyChecker-accredited online pharmacies. Lowest U.S. Pharmacy Price: $0.36 per tablet. To buy Viagra online or in person, you need a prescription. Telehealth brands can help you get quickly and discreetly. “Generic Viagra” is often just the main ingredient, sildenafil. One main. 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. Sildenafil is used to treat erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. 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 (Viagra) is a tablet that's taken by mouth for erectile dysfunction (ED) in adults. It works as a phosphodiesterase-5 (PDE5) inhibitor to help people get an erection or keep an erection that lasts for sex.