Such patients must not apply any out-of-pocket expenses incurred using this Savings Offer toward any government insurance benefit out-of-pocket spending calculations, such as Medicare Part D true out-of-pocket TrOOP costs You are responsible for reporting use of this Savings Offer to any private insurer, health plan, or other third party who pays for or reimburses any part of the prescription filled using this Savings Offer, as may be required. Alpha-blockers are sometimes prescribed for prostate problems or high blood pressure. Oral medicines for ED usually work well and cause few side effects. Patients should always ask their doctors for medical advice about adverse events. These medicines are called PDE5 inhibitors.See risks & benefits. Learn more about what VIAGRA® (sildenafil citrate), a prescription treatment for ED. See risks & benefits. Learn more about what VIAGRA® (sildenafil citrate), a prescription treatment for ED. · Viagra treats erectile dysfunction (ED) in adults. It’s usually taken about 1 hour before sexual activity. Below, you’ll find information about recommended dosages and how to take Viagra.