how many milligrams of ritalin should an adult take?
<answer> 20 to 30 mg/day <context> Basically, the safe dosage, frequency, and duration of treatment is suggested by your doctor and you should not take more Ritalin, more often, or in a different way than prescribed. While the dosage range varies for children, the average daily dose of methylphenidate for adults is 20 to 30 mg/day.