"i&#039;m 18 years old and have been on 18mg of concerta for just under a year now. in the beginning i loved it - was able to focus and was very productive with everything. positives: my grades and work ethic excelled, accomplished a lot, confidence raised. but, it may have just been me, but after being on concerta i became very antisocial (the complete opposite of myself) and basically got lost in my head. i also suffer from depression and severe seasonal effective disorder and my first winter taking the concerta was a horrible experience. the important thing to remember with this medicine is that it is not what is making you &quot;smarter&quot; or more accomplished, it is merely helping you to do these things without your adhd holding you back."