Hello, I m a clinical psychologist and I conducted an eval with a 9 year old client who is diagnosed with ADHD, and currently taking Focalin - I don t have the dosage. He was not on his medication at the time of the evaluation, and I noticed no symptoms of hyperactivity or inattention over a two hour timeframe in the middle of the day. How long with the medication stay in his system? I believed it to be short lasting. His guardian indicates his dosage is effective for remediating symptoms at home and at school. Global question: Does Focalin help kids, mediate symptoms, who do not have ADHD?