What special dietary instructions should I follow? Some examples of nitrates are nitroglycerin Nitro-Dur, Nitrostat, others , isosorbide mononitrate Monoket and isosorbide dinitrate Bidil. These include itraconazole Sporanox, Tolsura , ketoconazole Extina, Ketozole, others and ritonavir Norvir. Avanafil Stendra. Do not take more or less of it or take it more often than prescribed by your doctor. Tell your doctor if you have ever been advised by a health care professional to avoid sexual activity for medical reasons.What is vardenafil? Vardenafil is used in adult men to treat erectile dysfunction (impotence). Vardenafil may also be used for purposes not listed in this medication guide. Vardenafil side effects Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat. Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. This boosts blood flow and helps you get an erection from sexual activity. How oral medicines differ Each oral medicine for ED has a slightly different chemical makeup. Vardenafil is the generic name of the drugs Levitra and Staxyn. It’s used to treat erectile dysfunction. If you’re currently dealing with ED, you can speak with a doctor to see if vardenafil.