This medicine is available only with your doctor’s prescription. If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. You’ll soon start receiving the latest Mayo Clinic health information you requested in your inbox. The products discussed in this site may have different product labeling in different countries. Alpha-blockers are sometimes prescribed for prostate problems or high blood pressure.Summary. Sildenafil is a medication prescribed for the treatment of impotence (erectile dysfunction, ED) caused by medical or psychological conditions. The most common side effects are facial flushing (1 in 10), headaches (1 in 6), stomach pain, nasal congestion, nausea, dizziness, rash, urinary tract infections (UTIs), diarrhea, and . 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] It is unclear if it is effective for treating sexual dysfunction in females. [8]. Brand names: Viagra, Revatio. Sildenafil comes in three forms: an oral tablet, an oral suspension (liquid), and an injection that’s only given by a doctor. .