Key Takeaways Sildenafil is commonly prescribed for erectile dysfunction and pulmonary arterial hypertension, with dosage varying by condition and patient needs. Typical adult doses range from 25 mg to 100 mg for erectile dysfunction, taken about an hour before sexual activity. For pulmonary arterial hypertension, sildenafil is often given in lower doses multiple times a day. Dosage. Sildenafil is used to treat erectile dysfunction in adult men or pulmonary arterial hypertension in adults and children, depending on the brand or formulation. Includes sildenafil side effects, interactions, and indications. Sildenafil oral tablet is a prescription medication used to treat erectile dysfunction (ED) and pulmonary arterial hypertension (PAH). Sildenafil is also used in both men and women to treat the symptoms of pulmonary arterial hypertension. This is a type of high blood pressure that occurs between the heart and the lungs. Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. 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 hypertension (PAH; high blood pressure in the vessels carrying blood to the lungs, causing shortness of. Sildenafil, sold under the brand name Viagra among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. [4][8] It is also sometimes used off-label for the treatment of certain symptoms in secondary Raynaud's phenomenon. [9] Find patient medical information for Sildenafil (Viagra, Revatio) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Sildenafil (Viagra) Other brand names: Aronix, Liberize, Nipatra, Revatio, Grandipam. Find out how sildenafil treats erection problems and pulmonary hypertension and how to take it. Sildenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). Learn about side effects, drug interactions, dosages, warnings, and more. Find drug information for Sildenafil on CVS.com, including related drug classes, side effects, dosage, and answers to frequently asked questions.