Hi there:

Generally speaking, you should give a new ADHD medication at least a few weeks to take full effect. One day is definitely not long enough to judge a med's effectiveness in controlling impulsivity, improving focus, etc. I would say: Try not to get discouraged, but give your son at least until the end of the month on his Focalin prescription before talking with your doctor about increasing his dosage or changing his medication.

Also, here is a great article about ADHD medication that might help:

http://www.additudemag.com/adhd/article/718.html

Best of luck!

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