Hello the person is going to use 10 mg ritalin . He has no disorders he is going to use is it as an asset that helps to STUDY and concentrate for a long period of time . How often and what should be the dosage for the person to avoid addiction and huge side effects ? The person is 21 years old , never had any psychological problems , excellent health , good diet , regular exercising . A lot of stress from high intense of studying , sometimes feels slight depression or enxiety. Are there any supplements that the person could combine with the drug in order to avoid side effects as much as possible . Thank you