ults up to 65 years of age—50 milligrams (mg) as a single dose no more than once a day, 1 hour before sexual intercourse. Alternatively, the medicine may be .You may need to relax a little, or cut down on alcohol too. Follow your doctor’s orders or the directions on the label. You can take it in a small dose daily or in a larger dose as needed. Ask your healthcare professional how you should dispose of any medicine you do not use. It knocks your confidence in the bedroom and can make you shy away from sexual activity altogether, which is not something that you or your partner will want. Some examples of nitrates are nitroglycerin Nitro-Dur, Nitrostat, others , isosorbide mononitrate Monoket and isosorbide dinitrate Bidil.The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Talafil (Cialis). Vardenafil. These medicines are called . Based on effectiveness and toleration, the dose may be increased to a maximum recommended dose of mg or decreased to 25 mg. Be sure to tell your doctor about . Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a prescription drug that’s used in ult .Stop taking VIAGRA and call your healthcare provider right away if you have any sudden vision loss sudden hearing decrease or hearing loss. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. Sudden vision loss in one or both eyes can be a sign of a serious eye problem called non-arteritic anterior ischemic optic neuropathy NAION. These include itraconazole Sporanox, Tolsura , ketoconazole Extina, Ketozole, others and ritonavir Norvir. Your doctor may adjust your dose if needed.