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In addition, you must state, in writing, that the medication is for your personal use. Oral ED medicines might not work or might be dangerous if you also take any of the following: Nitrate medicines. These are commonly prescribed for an enlarged prostate or male pattern baldness. Medications that are not approved by the FDA may not be allowed. These medicines all work well for ED. Vardenafil usually works for 4 to 5 hours.Generic name: sildenafil (oral) [ sil-DEN-a-fil ] Brand names: Revatio, Viagra Drug classes: Agents for pulmonary hypertension, Impotence agents. Medically reviewed by Kaci . Generic name: sildenafil (oral) [ sil-DEN-a-fil ] Brand names: Revatio, Viagra Drug class: Impotence agents Medically reviewed by Sophia Entringer, PharmD. Last updated on . Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes muscles .