Also tell your doctor if you or any of your family members have or have ever had an eye disease such as retinitis pigmentosa an inherited eye condition that causes loss of vision or if you have ever had sudden severe vision loss, especially if you were told that the vision loss was caused by a blockage of blood flow to the nerves that help you see. Sildenafil Viagra is used to treat erectile dysfunction impotence; inability to get or keep an erection in men. Do not keep outdated medicine or medicine no longer needed. Talk to your doctor about eating grapefruit and drinking grapefruit juice while taking this medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine. Tell your doctor if any of these symptoms are severe or do not go away: headache. Children 1 year of age and older weighing 45 kilograms kg or more—20 mg 3 times a day.Typical dosing for Sildenafil (Viagra) The typical dose is to take 50 mg of sildenafil (Viagra) by mouth, about 1 hour before sex, as needed. The maximum . Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Sildenafil (Liqrev, Revatio) is used to improve the ability to exercise in .

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