By Kindergarten, we had more concern. Acronyms such as ADD, PDD, ADHD, ODD
were tossed around. A trip to pediatric neurologist was suggested, and we then heard PDD (autistic spectrum disorder). His behaviors suggested ADD, mostly impulisivity, etc.
We've trialed two ADD stimulant drugs to curb his impulsive behaviors, but ended up with a kid on speed! The non-stimulant ADD drug Strattera seemed to make a nice impact on his attention span for school work, etc., and he remains on this.