Presence of branded drugs and increasing prevalence of erectile dysfunction worldwide. This allows the smooth muscles in the penis to relax and fill with blood. Other uses for this medicine This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information. Data collection 2. Shunt direction and severity of pulmonary hypertension; T, treprostinil; S, sildenafil. You should only be treated with one of these products at a time.Get sildenafil for as low as $, which is 99% off the average retail price of $ for the most common version, by using a GoodRx coupon. Prices Medicare Drug Info Side Effects Images Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in men. You can get a prescription for sildenafil at the Optum Store by following the same steps you would for Viagra. Why it’s used Sildenafil oral tablet is used to treat ED and PAH. Generic oral tablets are available for both conditions, but the brand-name drugs each treat only one of the conditions. Viagra.