Specification :

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 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. During sexual activity, if you become dizzy or nauseated, or have pain, numbness, or tingling in your chest, arms, neck, or jaw, stop and call your doctor right away. You could be having a serious side effect of Viagra. Do not take Viagra more than once a day. Allow 24 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 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, 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 not clear whether Viagra is the actual cause of vision loss. Stop using Viagra and get emergency medical help if you have sudden vision loss.