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Like all medicines, Viagra can cause some side effects of viagra.
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Less common side effects of viagra that may occur are temporary changes in color vision (such as trouble telling the difference between blue and green objects or having a blue color tinge to them), eyes being more sensitive to light, or blurred vision. 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. Heart attack, stroke, irregular heart beats, and death have been reported rarely as effects of viagra in men taking Viagra.
Most, but not all, of these men had heart problems before taking this medicine. It is not possible to determine whether these events were directly related to Viagra. Viagra may cause other side effects of viagra besides those listed on this sheet. If you want more information or develop any side effects of viagra or symptoms you are concerned about, call your doctor.
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