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Revatio 20 mg relaxes muscles of the blood vessels and increases blood flow to particular areas of the body. Revatio is used to treat pulmonary arterial hypertension and improve exercise capacity in men and women. Sildenafil is used to treat erectile dysfunction in men.Many people using this medication do not have serious side effects. Rarely, sudden decreased vision, including permanent blindness, in one or both eyes may occur. If this serious problem occurs, stop taking sildenafil and get medical help right away.