If it is not treated right away, priapism can permanently damage your penis sudden vision loss in one or both eyes. How oral medicines differ Each oral medicine for ED has a slightly different chemical makeup. Alpha-blockers are sometimes prescribed for prostate problems or high blood pressure. These medicines are called PDE5 inhibitors. Some examples of nitrates are nitroglycerin Nitro-Dur, Nitrostat, others , isosorbide mononitrate Monoket and isosorbide dinitrate Bidil. You are encouraged to report adverse events related to Viatris products by calling U.Typical dosing for Sildenafil (Viagra) The typical dose is to take 50 mg of sildenafil (Viagra) by mouth, about 1 hour before sex, as needed. The maximum recommended dose is . Generic Viagra (sildenafil) is an alternative to the branded Viagra drug that can be used for treating erectile dysfunction (ED). It’s now sold by many manufacturers, including online. Viagra (sildenafil) is a brand-name oral tablet prescribed for erectile dysfunction. The cost of the drug with and without insurance can depend on several factors, such as whether .