You should also call your insurance company to see if they cover erectile dysfunction medications. Those who don’t feel comfortable discussing ED with an in-person provider or lack time to visit a doctor’s office may find online ED prescriptions beneficial. If you are taking sildenafil for erectile dysfunction, you are unlikely to miss a dose since this medication is taken as needed, not on a regular dosing schedule. Talk with your healthcare provider about your sex life and desired use. If you are taking sildenafil to treat PAH, you will probably take sildenafil three times a day with or without food. Erectile dysfunction medications require a prescription from a licensed provider. Never purchase ED medications from a site or service that doesn’t require a prescription and medical documentation.Consumer Reports Best Buy Drugs shares how you might be able to get generic Viagra, known as sildenafil, at a much lower price. Dizziness, headache, flushing, or stomach upset may occur. Vision changes such as increased sensitivity to light, blurred vision, or trouble telling blue and green colors apart may also occur. If. It is available in generic and brand versions. 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 using a GoodRx coupon.