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Viagra (sildenafil) relaxes muscles and increases blood flow to particular areas of the body.
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. Do not take Viagra while also taking Revatio, unless your doctor tells you to.
Viagra may also be used for other purposes sildenafil not listed in this medication guide.

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Do not take Viagra if you are also using a sildenafil 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 and dry amyl nitrate or nitrite ("poppers"). Taking Viagra with a nitrate medicine can cause a sudden and serious decrease in blood sildenafil pressure. During sexual activity, if you become dizzy or nauseated, or have pain, numbness, or tingling in your chest, arms, neck, or jaw, stop sildenafil and call your doctor right away. You could be having a serious side effect of Viagra.

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Do not take Viagra more than once a day. Allow 24 sildenafil hours to pass between Doses. Contact your doctor or seek emergency medical attention if your erection is painful or lasts longer than 4 hours. A prolonged erection (priapism) can damage the penis.Viagra can decrease blood flow to the optic nerve sildenafil of the eye, Causing sudden vision loss. This has occurred in a small number of people taking Viagra, most of whom also had heart disease, sildenafil diabetes, high blood pressure, high cholesterol, or Certain pre-existing eye problems, and in those who smoke or are over 50 years old. It is sildenafil not clear Whether Viagra is the actual cause of vision loss.