Revatio 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 under the name Viagra is used to treat erectile dysfunction (impotence) in men.

For treatment of erectile dysfunction: For oral dosage form (tablets): Adults up to 65 years of age—50 milligrams (mg) as a single dose no more than once a day, 1 hour before sexual intercourse.

Erectile Dysfunction. Viagra only. Indicated for erectile dysfunction. 50 mg PO ~1 hr before sexual activity; however, may be taken anywhere from 30 min to 4 hr before sexual activity....

The recommended dosage of REVATIO is 20 mg three times a day. Dose may be titrated to a maximum of 80 mg three times a day, if required, based on symptoms and tolerability.

Erectile Dysfunction. For this use, sildenafil is used only when needed. Take it as your healthcare provider recommends, which is usually between 30 minutes to four hours before planned...