Generic sildenafil is covered by most Medicare and insurance plans, but some pharmacy coupons or cash prices may be lower. Get sildenafil for as low as $, which is 95% off the average retail price of $ for the most common version, by using a GoodRx coupon. See more.Brand names Why is this medication prescribed? If you have certain health conditions or are taking certain medications, your doctor may tell you to take sildenafil less often. However the dose is usually not more than 40 mg 3 times a day. The following nonprescription or herbal products may interact with sildenafil: cimetidine Tagamet HB , St. If you become pregnant while taking sildenafil, call your doctor. Sorry something went wrong with your subscription Please, try again in a couple of minutes Retry. Ask your pharmacist for a list of the ingredients.Sildenafil is in a class of medications called phosphodiesterase (PDE) inhibitors. Sildenafil treats erectile dysfunction by increasing blood flow to the penis during sexual stimulation. This increased blood flow can cause an erection. Sildenafil treats PAH by relaxing the .  · 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. Alternatively, the medicine may be taken 30 minutes to 4 . Generic sildenafil is covered by most Medicare and insurance plans, but some pharmacy coupons or cash prices may be lower. Get sildenafil for as low as $, which is 95% off the average retail price of $ for the most common version, by using a GoodRx coupon. See more.Ask your pharmacist for a list of the ingredients. Children 1 year of age and older weighing 45 kilograms kg or more—20 mg 3 times a day. Children 1 year of age and older weighing 20 kg or less—10 mg 3 times a day. 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. This can happen if you are sick with fever, diarrhea, or vomiting; sweat a lot; or do not drink enough liquids.