Rarely reported side effects include: an erection that will not go away priapism. Some services offer a subscription option where they’ll send your medications every month at a discount. Children 1 year of age and older weighing 45 kilograms kg or more—20 mg 3 times a day. If you see air bubbles in the syringe, repeat the steps. Children 1 year of age and older weighing 20 kg or less—10 mg 3 times a day. Brand names Why is this medication prescribed?VIAGRA is available by prescription only in 25 mg, 50 mg, and mg tablets. Patients should always ask their doctors for medical advice about adverse events. You are encouraged to report adverse events related to Viatris products by calling 1 . Cialis lasts up to 36 hours in the body, while Viagra lasts 4–6 hours in the body. Both are taken 30 minutes before sex. Cialis can cause limb pain, while Viagra can cause vision change, rash. According to price-comparison site test1.ru, generic Revatio will cost you as little as $ per pill, depending on where you fill your prescription. That’s compared with .