CLICK HERE TO BUY Revatio 20 mg is a prescription medication containing sildenafil, which is a phosphodiesterase type 5 inhibitor. It's specifically used to treat pulmonary arterial hypertension , a condition characterized by high blood pressure in the arteries of the lungs, which can lead to symptoms like shortness of breath and fatigue. Revatio is used to improve exercise capacity and reduce symptoms associated with PAH. It's intended for use in adults and sometimes in children with certain conditions.