On this page Highlights for sildenafil Sildenafil oral tablet is available as a brand-name drug and as a generic drug. Brand names: Viagra, Revatio. Sildenafil .Take sildenafil exactly as directed. Do not use more of it and do not use it more often than your doctor ordered. Your doctor may adjust your dose as needed and tolerated. Do not start these medications while taking sildenafil without discussing it with your healthcare provider. If you are taking sildenafil to treat PAH, you will probably take sildenafil three times a day with or without food. For treatment of pulmonary arterial hypertension: For oral dosage forms suspension or tablets : Adults—20 milligrams mg 3 times a day. Do not press on the plunger of the syringe.Cost Overdose Ask your doctor Q&A Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a . Sildenafil (Liqrev, Revatio) is used to improve the ability to exercise in adults (Liqrev, Revatio) and children 1 year of age and older (Revatio) with pulmonary arterial . On this page Highlights for sildenafil Sildenafil oral tablet is available as a brand-name drug and as a generic drug. Brand names: Viagra, Revatio. Sildenafil .This is especially important for women since using Sildenafil is an off-label treatment for sexual enhancement. Also tell your doctor if you have or have ever had pulmonary veno-occlusive disease PVOD; blockage of veins in the lungs ; a stomach ulcer; heart, kidney, or liver disease; a heart attack; heart failure; angina chest pain ; an irregular heartbeat; a stroke; chest pain; high or low blood pressure; high cholesterol; a bleeding disorder; blood circulation problems; blood cell problems such as sickle cell anemia a disease of the red blood cells , multiple myeloma cancer of the plasma cells , or leukemia cancer of the white blood cells ; conditions affecting the shape of the penis e. Do not take a double dose to make up for a missed one. However, Sildenafil does increase genital blood flow, which can increase the sexual response for both men and women. The following nonprescription or herbal products may interact with sildenafil: cimetidine Tagamet HB , St. How should this medicine be used?