My friend took an overdose of Concerta, 6 of 36mg. He said he sees changes in his everyday life, a little depression, tiredness, nervous and uncomfortable around a lot of people (a crowd) such as at school or at a concert, a little aggressive, dizziness, jerking of the head, muscle movements, feelings of almost fainting. He dosent get a lot of sleep, that might be part of the problem. We tried looking up any information on the Internet, but no help there. Please help. Could an overdose lead to long term side effects and/or changes in everyday life? If so, how could this be reversed, cured, or treated?