Doses for children can range from 10mg to 20mg taken 3 times a day, depending on their weight. You’ll soon start receiving the latest Mayo Clinic health information you requested in your inbox. You may opt-out of email communications at any time by clicking on the unsubscribe link in the e-mail. If too much is used, the chance of side effects is increased. Remove the cap by pushing it down and twisting it counter-clockwise. Adults 65 years of age and older—25 mg as a single dose no more than once a day, 1 hour before sexual intercourse. However the dose is usually not more than 40 mg 3 times a day.As the second most popular ED drug after Cialis, Viagra received a lot of attention when its first generic version, manufactured by Teva Pharmaceuticals, became available back in . It depends on a few factors, including your age and why you’re taking it, since Viagra is not only used to treat ED. Your doctor will tell you how much you should take. For help with erections. Sildenafil Citrate Coupons, Prices, and Savings Card. Brand Names: Revatio, Viagra. Sildenafil is used to treat male sexual function problems (impotence or erectile .

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