"i&#039;m 19 and i&#039;ve been on concerta since age 7 . it has helped me no doubt. i have never had any problems as people say above stomach problems i have never had any. the only thing is i keep eating the complete opposite of everyone else. i usually take it at 9am everyday and i notice it wearing of around 6pm. yesterday i didn&#039;t take because i tried something. i&#039;m currently working night shift usually it&#039;s been out of my system hours before starting work. so tonight i took it 9pm even though now it&#039;s 4.30am and i&#039;ve been awake since 7am yesterday i neither show or feel any signs of being tired, drained both physically or mentally. this medication has been nothing but a success for me."