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Viagra relaxes muscles and increases blood flow to particular areas of the body. |
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Sildenafil under the name Viagra is used to treat erectile dysfunction (impotence) in men. Another brand of sildenafil is Revatio, which is used to treat pulmonary arterial hypertension and improve exercise capacity in men and women. |
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Viagra may also be used for purposes other than those listed here. |
What should I discuss with my healthcare provider before taking Viagra? |
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Do not take Viagra if you are also using a nitrate drug for chest pain or heart problems. This includes nitroglycerin (Nitrostat, Nitrolingual, Nitro-Dur, Nitro-Bid, and others), isosorbide dinitrate (Dilatrate-SR, Isordil, Sorbitrate), and isosorbide mononitrate (Imdur, ISMO, Monoket). Nitrates are also found in some recreational drugs such as amyl nitrate or nitrite ("poppers"). Taking Viagra with a nitrate medicine can cause a serious decrease in blood pressure, leading to fainting, stroke, or heart attack. |
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A small number of patients have had a sudden loss of eyesight after taking Viagra. This type of vision loss is caused by decreased blood flow to the optic nerve of the eye. It is not clear whether Viagra is the actual cause of such vision loss. Sudden vision loss with Viagra use has occurred most often in people with heart disease, diabetes, high blood pressure, high cholesterol, or certain pre-existing eye problems, and in those who smoke or are over 50 years old. |
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Before taking Viagra, tell your doctor if you have: |
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heart disease or heart rhythm problems; |
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a recent history (in the past 6 months) of a heart attack, stroke, or heart rhythm disorder; |
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congestive heart failure; |
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high or low blood pressure; |
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coronary artery disease; |
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a blood cell disorder such as sickle cell anemia, multiple myeloma, or leukemia; |
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a bleeding disorder such as hemophilia; |
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retinitis pigmentosa (an inherited condition of the eye); |
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a physical deformity of the penis (such as Peyronie's disease); or |
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if you have been told you should not have sexual intercourse for health reasons. |
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If you have any of these conditions, you may not be able to use Viagra or you may need a dosage adjustment or special tests during treatment. |
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FDA pregnancy category B: This medication is not expected to be harmful to an unborn baby. Do not use Viagra without telling your doctor if you are pregnant or plan to become pregnant during treatment. |
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It is not known if Viagra passes into breast milk or if it could harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby. |
How should I take Viagra? |
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Take Viagra exactly as it was prescribed for you. Do not take it in larger doses or for longer than recommended by your doctor. |
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Revatio is usually taken three times each day, about 4 to 6 hours apart. |
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Viagra is usually taken only when needed, 30 minutes to 1 hour before sexual activity. You may take it up to 4 hours before sexual activity. Do not take Viagra more than once per day. |
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Viagra can help you have an erection when sexual stimulation occurs. An erection will not occur just by taking a pill. Follow your doctor's instructions. |
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If you become dizzy or nauseated, or have pain, numbness, or tingling in your chest, arms, neck, or jaw during sexual activity, stop and call your doctor right away. You could be having a serious side effect of Viagra. |
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Store this medication at room temperature away from moisture and heat. |
What happens if I miss a dose of Viagra? |
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Viagra is used as needed, so you are not likely to miss a dose. |
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If you miss a dose of Revatio, take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and take the medicine at the next regularly scheduled time. Do not take extra medicine to make up the missed dose. |
What happens if I overdose with Viagra? |
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Seek emergency medical attention if you think you have used too much of this medicine. Symptoms of a Viagra overdose may include chest pain, nausea, irregular heartbeat, and feeling light-headed or fainting. |
What should I avoid while taking Viagra? |
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Avoid drinking alcohol, which can increase some of the side effects of Viagra. |
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Avoid using other medicines to treat impotence, such as alprostadil (Caverject, Muse, Edex) or yohimbine (Yocon, Yodoxin, others), without first talking to your doctor. |
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