You may opt-out of email communications at any time by clicking on the unsubscribe link in the e-mail. Children younger than 1 year of age—Use and dose must be determined by your doctor. Different brands may not work the same way. Follow your doctor’s orders or the directions on the label. Your doctor may adjust your dose if needed. Do not keep outdated medicine or medicine no longer needed. However, the dose is usually not more than 80 mg 3 times a day.DRUG_DESCRPTION Compare DRUG_NAME prices and find coupons that could save you up to 80% instantly at pharmacies near you such as CVS, Walgreens, Walmart, . Generic Viagra (sildenafil) is an alternative to the branded Viagra drug that can be used for treating erectile dysfunction (ED). It’s now sold by many manufacturers, including online. Brand names: Revatio, Viagra. Drug classes: Agents for pulmonary hypertension, Impotence agents. Medically reviewed by Kaci Durbin, MD. Last updated on .