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. Your primary care doctor should always know what medications you’re taking, including ED pills prescribed by another provider. If it is not treated right away, priapism can permanently damage your penis sudden vision loss in one or both eyes. Insurance can help you save even more on consultations and medications. Some examples of nitrates are nitroglycerin Nitro-Dur, Nitrostat, others , isosorbide mononitrate Monoket and isosorbide dinitrate Bidil. If you have an erection that lasts more than 4 hours, get medical help right away. · In addition to Viagra, other ED drugs available in the United States include avanafil (Stendra), tadalafil (Cialis) and vardenafil (Levitra). These all improve blood supply to the penis. In combination with sexual stimulation, the drugs can produce an erection sufficient to initiate and complete intercourse. There is also a fast-dissolving form. Melissa Badowski, PharmD, MPH, FCCP — Jennifer Mitri Williamson, Pharm.D. — Updated on September 12, Learn about uses, how it works, and more for Viagra (sildenafil). It’s a prescription. Consumer Reports Best Buy Drugs shares how you might be able to get generic Viagra, known as sildenafil, at a much lower price.