For example, do they tend to happen as the
dose is wearing off and right before another
dose, or do they tend to happen when the
ritalin is at its strongest (about an hour after taking the medication)? There's something called a "rebound effect" where the child goes from having too much ritalin in his system to too little ritalin, and the behavior bounces around accordingly.
In general, what was his behavior like before Ritalin?