'''
Adults—20 to 30 milligrams (mg) given in divided doses 2 or 3 times a day, taken 30 to 45 minutes before meals. Your doctor may adjust your dose as needed. However, the dose is usually not more than 60 mg per day.
'''
That's also assuming the retarded pill, which is already too much for a first time dosage. If this was unretared, no doubt the patients felt completely wired. And of course, the authors conveniently fail to measure physical well being. Just insane that Science publishes this imo.
from the mayo clinic: https://www.mayoclinic.org/drugs-supplements/methylphenidate....
''' Adults—20 to 30 milligrams (mg) given in divided doses 2 or 3 times a day, taken 30 to 45 minutes before meals. Your doctor may adjust your dose as needed. However, the dose is usually not more than 60 mg per day. '''