For treatment of pulmonary arterial hypertension: For oral dosage forms suspension or tablets : Adults—20 milligrams mg 3 times a day. If you experience a sudden loss of vision in one or both eyes, contact your doctor immediately. May make this condition worse. Patients are advised not to exceed a maximum dosing frequency of once daily. 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. Sildenafil for pulmonary hypertension can also be known by the brand names Revatio and Grandipam. The trial results revealed that sildenafil had improved the patients’ depression, anxiety, and self-esteem.Sildenafil (Revatio) can be taken with or without food. Taking it with food may help prevent upset stomach. Separate your doses by 4 to 6 hours. Taking your doses too close together can raise your risk of side effects. The oral liquid (suspension) is good for 60 days either at room temperature or in the fridge. Refill and transfer prescriptions online or find a CVS Pharmacy near you. Shop online, see ExtraCare deals, find MinuteClinic locations and more.  · Compare prescription drug prices and find coupons at more than 70, US pharmacies. Save up to 80% instantly!