·	a nitrate such as nitroglycerin (Nitrostat, Nitrolingual, Nitro-Dur, Nitro-Bid, Minitran, Deponit, Transderm-Nitro, others), isosorbide dinitrate (Dilatrate-SR, Isordil, Sorbitrate), isosorbide mononitrate (Imdur, ISMO, Monoket), and others;

·	a recreational drug such as amyl nitrate or nitrite ("poppers"); or

·	an alpha blocker such as doxazosin (Cardura), guanadrel (Hylorel), prazosin (Minipress), terazosin (Hytrin), alfuzosin (Uroxatral), tamsulosin (Flomax), and others.

·	Before taking Levitra, tell your doctor if you currently have or have ever had a heart attack, stroke, irregular heartbeats, angina (chest pain), or congestive heart failure;

·	have high or low blood pressure;

·	have a personal or family history of a rare heart condition known as prolongation of the QT interval (long QT syndrome);

·	have liver problems;

·	have kidney problems;

·	have ever had blood problems, including sickle cell anemia, multiple myeloma, or leukemia;

·	have a bleeding or blood clotting disorder;

·	have a stomach ulcer;

·	a family history of degenerative eye disease (e.g., retinitis pigmentosa); or

·	have a physical deformity of the penis such as Peyronie's disease.

·	an allergic reaction (difficulty breathing; closing of the throat; swelling of the lips, tongue, or face; or hives);

·	chest pain or an irregular heartbeats;

·	swelling of the ankles or legs;

·	shortness of breath;

·	prolonged or severe dizziness;

·

fainting;

·	a prolonged (lasting longer than 4 hours) or painful erection;

·	dizziness, nausea, or angina (pain, tightness, discomfort, numbness, or tingling in the chest, arms, neck, or jaw); or

·	back pain.

·

flushing;

·	mild dizziness;

·

headache;

·	nasal congestion;

·	stomach upset;

·	sensitivity of the eyes to light; or

·	temporary blue tint in vision or other vision abnormalities.