"some of these experiences are quite alarming! i never experienced the really harsh side effects such as depression, suicidal thoughts and any other bad side effects. i&#039;ve been taking concerta ever since i was 8. i was taken off of concerta when i was 21 and i actually went down hill after that. i lost a lot of my friends and i can&#039;t control my thoughts, day dreams and mood swings and my performance at my job declined rapidly to the point where i almost lost it. i am 23 now and just got back on concerta and am super happy with how it has organized my mind! ."