Hello, I'm 19 years old and just got diagnosed, as one would say, with ADD/ADHD rather recently. I was given a prescription for Concerta 36mg to be taken daily. This is the third week taking it and I have been noticing some odd side effects. On days when I take it in the morning and don't eat I feel nauseous and generally off, which I was warned about prior so it doesn't worry me as much. However, I have also noticed quite a difference in my mood.