Levitra (vardenafil) is a medicine specially intended for males suffering from impotence and unable to enjoy normal sex life as a result of this condition. This drug is supposed to be taken in complete accordance with your health care provider's recommendations to make sure you benefit from the treatment. Levitra should not be combined with nitrate-based medications such as butyl nitrate, nitroglycerin, amyl nitrate, isosorbide mononitrate, isosorbide dinitrate, or any other ones, as dangerous interactions are possible. You must inform your health care provide of the fact of taking any other drugs to make sure no interactions occur. Please mention any of the following ones: isoniazid, antibiotics, HIV/AIDS medicines, diclofenac, conivaptan, imatinib, antidepressants, heart rhythm medicines, antifungal medications, drugs to treat high blood pressure, heart or blood pressure medications, and any other over-the-counter or prescription products. Make sure you report to your health care provider any serious side effects that can be any of the following ones: fainting, changes in color vision, dizziness, sudden severe loss of vision, priapism, hives, swelling of the face, throat, or tongue, hoarseness, difficulty breathing or swallowing, blurred vision, or ringing in ears.