Patients should always ask their doctors for medical advice about adverse events. The most common symptoms of erectile dysfunction include difficulty achieving or maintaining an erection and reduced sexual desire. Make sure to get an estimate of when you can expect your prescription in the mail. This information is reviewed by a licensed practitioner who will assess your eligibility for the medication. Some people may also have ringing in their ears tinnitus or dizziness.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 99% off the average retail price of $ for the most common version, by . This Savings Offer is not valid when the entire cost of your prescription drug is eligible to be reimbursed by your private insurance plans or other health or pharmacy benefit programs; Pay for your VIAGRA prescription and mail copy of original pharmacy receipt (cash register receipt NOT valid) with product name, date, and amount circled to. About sildenafil (Viagra) Sildenafil is a medicine used to treat erection problems (erectile dysfunction). Sildenafil is also sometimes used to treat pulmonary hypertension (high blood pressure in the blood vessels that supply the lungs). If you have erection problems sildenafil works by temporarily increasing blood flow to your penis when.