Revatio is used to treat the erectile dysfunction in men. This uses sildenafil as its active ingredient. Sildenafil works by relaxing and widening the blood vessels of the penile region, resulting men to get an erection. This medicine is also used to treat the pulmonary hypertension. This medication is available in different variants. Such as: Revatio 10 mg and Revatio 20 mg. When this medicine is prescribed for erectile dysfnction, then it is consumed by adult men once in at least 24 hours apart. But when this medicine is prescribed for pulmonary hypertension, then it can be consumed by both males and females 3 times a day in at least 4 to 6 hours apart. If you are taking this medicine for erectile dysfunction then it is prescribed to take 30 to 60 minutes before any sexual activity.