comparison study of viagra cialis levitra

What is the most important information I should know about Levitra?
• Do not take Levitra if you are taking any of the following medicines:
· 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 comparison study of viagra cialis levitra.
• Taking Levitra with any of these medications may cause very low bloodpressure, possibly resulting in dizziness, fainting, stroke, or heart attack
• Contact your doctor or seek emergency medical attention for any erectionthat lasts longer than 4 hours comparison study of viagra cialis levitra. A sustained erection can damage the penis comparison study of viagra cialis levitra.
• Refrain from further sexual activity and notify your doctor it you developdizziness, nausea, or angina (pain, tightness, discomfort, numbness, or tinglingin the chest, arms, neck, or jaw) during sexual activity comparison study of viagra cialis levitra.
• Do not take Levitra more than once a day comparison study of viagra cialis levitra. In some cases, use of Levitramay be restricted to once every 72 hours (3 days) comparison study of viagra cialis levitra. Follow your doctor's instructions comparison study of viagra cialis levitra.

What is Levitra?
• Levitra relaxes muscles within the penis comparison study of viagra cialis levitra. This allows increased bloodflow into the penis which is necessary to achieve and maintain an erection comparison study of viagra cialis levitra.
• Levitra is used to treat erectile dysfunction (impotence) comparison study of viagra cialis levitra.
• Levitra may also be used for purposes other than those listed in thismedication guide comparison study of viagra cialis levitra.

What should I discuss with my healthcare provider before taking Levitra?
• Do not take Levitra if you are taking any of the following medicines:
· 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 comparison study of viagra cialis levitra.
• Taking Levitra with any of these medications may cause very low bloodpressure, possibly resulting in dizziness, fainting, stroke, or heart attack
• 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 asprolongation of the QT interval (long QT syndrome);
· have liver problems;
· have kidney problems;
· have ever had blood problems, including sickle cell anemia, multiplemyeloma, 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 comparison study of viagra cialis levitra.
• You may not be able to take Levitra, or you may require a dosage adjustmentor special monitoring during treatment if you have any of the conditions listedabove comparison study of viagra cialis levitra.
• Although Levitra is not indicated for use by women, it is in the FDApregnancy category B comparison study of viagra cialis levitra. This means that Levitra is not expected to be harmfulto an unborn baby comparison study of viagra cialis levitra. Levitra should not be taken by women comparison study of viagra cialis levitra.
• It is not known whether Levitra passes into breast milk comparison study of viagra cialis levitra. Levitra shouldnot be taken by women comparison study of viagra cialis levitra.
• If you are over 65 years of age, you may be more likely to experienceside effects from Levitra comparison study of viagra cialis levitra. Your doctor may prescribe a lower dose of the medication comparison study of viagra cialis levitra.

How should I take Levitra?
• Take Levitra exactly as directed by your doctor comparison study of viagra cialis levitra. If you do not understandthese directions, ask your pharmacist, nurse, or doctor to explain them to you comparison study of viagra cialis levitra.
• Take each dose with a full glass of water comparison study of viagra cialis levitra.
• Levitra can be taken with or without food comparison study of viagra cialis levitra.
• Levitra is usually taken when needed comparison study of viagra cialis levitra. Generally, it is taken about 1hour before sexual activity comparison study of viagra cialis levitra. The medication can help achieve an erection whensexual stimulation occurs comparison study of viagra cialis levitra. An erection will not occur just by taking a pill comparison study of viagra cialis levitra. Follow your doctor's instructions comparison study of viagra cialis levitra.
• Levitra should not be taken with grapefruit or grapefruit juice comparison study of viagra cialis levitra. Levitracan interact with grapefruit and grapefruit juice, and the interaction may havedangerous effects comparison study of viagra cialis levitra. You should discuss the use of grapefruit and grapefruit juicewith your doctor comparison study of viagra cialis levitra.
• Do not take Levitra more than once a day comparison study of viagra cialis levitra. In some cases, use of Levitramay be restricted to once every 72 hours (3 days) comparison study of viagra cialis levitra. Follow your doctor's instructions comparison study of viagra cialis levitra.
• If you develop dizziness, nausea, or angina (pain, tightness, discomfort,numbness, or tingling in the chest, arms, neck, or jaw) during sexual activity,refrain from further sexual activity and notify your doctor comparison study of viagra cialis levitra.
• Contact your doctor or seek emergency medical attention for any erectionthat lasts longer than 4 hours comparison study of viagra cialis levitra. A sustained erection can damage the penis comparison study of viagra cialis levitra.
• Store this medication at room temperature away from moisture and heat comparison study of viagra cialis levitra.

What happens if I miss a dose?
• Levitra is used as needed, so you are not likely to miss a dose comparison study of viagra cialis levitra.

What happens if I overdose?
• Seek emergency medical attention if an overdose is suspected comparison study of viagra cialis levitra.
• Symptoms of a Levitra overdose are not known, but are likely to includechest pain, back pain, dizziness, an irregular heartbeat, abnormal vision, andswelling of the ankles or legs comparison study of viagra cialis levitra.

What should I avoid while taking Levitra?
• Do not take any other drug used to treat impotence, such as alprostadil(Caverject, Muse, Edex) or yohimbine (Yocon, Yodoxin, others), without firsttalking to your doctor comparison study of viagra cialis levitra.
• Levitra should not be taken with grapefruit or grapefruit juice comparison study of viagra cialis levitra. Levitracan interact with grapefruit and grapefruit juice, and the interaction may havedangerous effects comparison study of viagra cialis levitra. You should discuss the use of grapefruit and grapefruit juicewith your doctor comparison study of viagra cialis levitra.

What are the possible side effects of Levitra?
• If you experience any of the following serious side effects, stop takingLevitra and seek emergency medical attention or contact your doctor immediately:
· 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 comparison study of viagra cialis levitra.
• Other, less serious side effects may be more likely to occur comparison study of viagra cialis levitra. Continueto take Levitra and talk to your doctor if you experience
· flushing;
· mild dizziness;
· headache;
· nasal congestion;
· stomach upset;
· sensitivity of the eyes to light; or
· temporary blue tint in vision or other vision abnormalities comparison study of viagra cialis levitra.
• Side effects other than those listed here may also occur comparison study of viagra cialis levitra. Talk to yourdoctor about any side effect that seems unusual or that is especially bothersome comparison study of viagra cialis levitra.

What other drugs will affect Levitra?
• Do not take Levitra if you are taking any of the following medicines:
· 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 comparison study of viagra cialis levitra.
• Taking Levitra with any of these medications may cause very low bloodpressure, possibly resulting in dizziness, fainting, stroke, or heart attack
• Before taking Levitra, tell your doctor if you are taking any of thefollowing medications:
· any other drug used to treat impotence, such as alprostadil (Caverject,Muse, Edex) or yohimbine (Yocon, Yodoxin, others);
· the antibiotic drug erythromycin (E-Mycin, Eryc, Ery-Tab, others);
· an antifungal medication such as itraconazole (Sporanox) or ketoconazole(Nizoral);
· a medication used to treat irregular heartbeats such as quinidine (Quinaglute,Quinidex, Quin-Release), procainamide (Procan SR, Procanbid, Pronestyl), amiodarone(Cordarone, Pacerone), or sotalol (Betapace, Sorine); or
· the HIV medications indinavir (Crixivan) or ritonavir (Norvir) comparison study of viagra cialis levitra.
• You may not be able to take Levitra, or you may require a dosage adjustmentor special monitoring during treatment if you are taking any of the medicineslisted above comparison study of viagra cialis levitra.
• Drugs other than those listed here may also interact with Levitra oraffect your condition comparison study of viagra cialis levitra. Talk to your doctor or pharmacist before taking any prescriptionor over-the-counter medicines, including vitamins, minerals, and herbal products comparison study of viagra cialis levitra.

Where can I get more information?
• Your pharmacist has additional information about Levitra written forhealth professionals that you may read comparison study of viagra cialis levitra.

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