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Besides, 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, therefore you could be having a serious side effect of Viagra pills.

In this way when take Viagra pills exactly as it was prescribed for you, because do not take it in larger doses or for longer than recommended by your doctor, so pills usually taken three times each day, about 4 to 6 hours apart.

Likewise do not take Viagra pills more than once a day. Allow 24 hours to pass between doses, then contact your doctor or seek emergency medical attention if your erection is painful or lasts longer than 4 hours, so prolonged erection can damage.

In this way when Viagra pills is usually taken only when needed, 30 minutes to 1 hour before sexual activity, therefore you may take it up to 4 hours before sexual activity, then do not take Viagra pills more than once per day.

Likewise small number of patients have had a sudden loss of eyesight after taking Viagra pills, therefore this type of vision loss is caused by decreased blood flow to the optic nerve of the eye, therefore it is not clear whether Viagra pills is the actual cause of such vision loss.

However, sudden vision loss with Viagra pills 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.