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Most, but not all, of these men had heart problems before taking this medicine. You could get dizzy, faint, or even have a heart attack or stroke. Nitrates are found in many prescription medicines that are used to treat angina. Viagra is only for patients with erectile dysfunction. Viagra is not for newborns, children, or women. Viagra must be used only under a doctor's supervision. This is only general information, and should not be relied on for any purpose. It should not be construed as containing specific instructions for any particular patient. We disclaim all responsibility for the accuracy and reliability of this information, and/or any consequences arising from the use of this information, including damage or adverse consequences to persons or property, however such damages or consequences arise. No warranty, either expressed or implied, is made in regards to this information.

Viagra increases the body's ability to achieve and maintain an erection during sexual stimulation. It should be taken as needed about 1 hour before sexual activity. Viagra should not be taken more than once a day. Do not take more or less of it or take it more often than prescribed by your doctor. Your doctor may prescribe a lower dose of this medication. These effects are usually mild to moderate and usually don't last longer than a few hours. Some of these side effects are more likely to occur with higher doses. In rare instances, men have reported an erection that lasts many hours. You should call a doctor immediately if you ever have an erection that lasts more than 4 hours. If not treated right away, permanent damage to your penis could occur.