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Viagra

Viagra is used for:

Treating erectile dysfunction (ED). It may also be used for other conditions as determined by your doctor.

Viagra is a phosphodiesterase inhibitor. It works by helping to increase blood flow into the penis during sexual stimulation. This helps you to achieve and maintain an erection.

Before using Viagra:

Some medical conditions may interact with Viagra . Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:

* if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement

* if you have allergies to medicines, foods, or other substances

* if you have a deformed penis (eg, cavernosal fibrosis, Peyronie disease), blood problems (eg, leukemia, multiple myeloma, sickle cell anemia), or any other condition that may increase the risk of a prolonged erection (eg, priapism)

* if you have a history of certain eye problems (eg, macular degeneration, optic neuropathy, retinitis pigmentosa, sudden vision loss)

* if you have a history of liver or kidney problems, high or low blood pressure, ulcers, bleeding problems, heart problems (eg, angina, aortic stenosis, heart failure, irregular heartbeat), or blood vessel problems

* if you have a history of heart attack, stroke, or life-threatening irregular heartbeat, especially within the past 6 months

* if you are using any other medical treatments that cause erections (eg, medicines injected or inserted into the penis, implants or vacuum pumps)

Some MEDICINES MAY INTERACT with Viagra . Tell your health care provider if you are taking any other medicines, especially any of the following:

* Alpha-blockers (eg, doxazosin), amlodipine, medicines for high blood pressure, nitrates (eg, isosorbide, nitroglycerin), or nitroprusside because severe low blood pressure with dizziness, lightheadedness, and fainting may occur

* Azole antifungals (eg, itraconazole, ketoconazole), fluvoxamine, H2 antagonists (eg, cimetidine, famotidine), HIV protease inhibitors (eg, ritonavir, saquinavir), macrolide antibiotics (eg, erythromycin), narcotic analgesics (eg, dihydrocodeine), or telithromycin because they may increase the risk of Viagra 's side effects

* Bosentan or rifampin because they may decrease Viagra 's effectiveness

This may not be a complete list of all interactions that may occur. Ask your health care provider if Viagra may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.

How to use Viagra:

Use Viagra as directed by your doctor. Check the label on the medicine for exact dosing instructions.

* An extra patient leaflet is available with Viagra . Talk to your pharmacist if you have questions about this information.

* Take Viagra by mouth with or without food. Viagra may not work as quickly if you take it with a high-fat meal.

* Viagra is usually taken about 1 hour before sexual activity; however, it may be taken anywhere from 4 hours to a half hour before sexual activity. Talk with your doctor about the best way to take Viagra .

* Do not take more of Viagra than recommended or take it more often than once daily, or as directed by your doctor.

* If you miss a dose of Viagra and you still intend to engage in sexual activity, take it as soon as you remember. Continue to take it as directed by your doctor.

Ask your health care provider any questions you may have about how to use Viagra .

Side effects of Viagra:

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:

Diarrhea; dizziness; flushing; headache; heartburn; mild, temporary vision changes (eg, blue/green color tint to vision, blurred vision, sensitivity to light); stuffy nose; upset stomach.

Seek medical attention right away if any of these SEVERE side effects occur:

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); chest pain; fainting; fast or irregular heartbeat; memory loss; painful or prolonged erection; ringing in the ears; seizure; severe or persistent dizziness; severe or persistent vision changes; sudden decrease or loss of vision in one or both eyes; sudden hearing loss.

This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088. You may also report side effects at http://www.fda.gov/medwatch.