Revatio 20 mg belongs to Sildenafil. It is an active ingredient in the well-known ED medication called Viagra. While Revatio is commonly used for treating pulmonary hypertension, doctors may also recommend Revatio 20 mg for off-label treatment of Erectile Dysfunction. The mechanism of action of Revatio 20 mg involves enhancing blood flow to the penis through the relaxation and dilation of blood vessels in the penile area. Typically, Revatio is taken three times daily. It can be consumed with or without food.