Yup. It'll solve behavior problems which are due to being hyper and don't actually have ADHD, but it won't solve ADHD.
There is also confusion about ADHD vs ADD, and how they aren't the same thing.
plenz - the symptoms you describe (good classroom behavior yet difficulties learning) sounds a lot like my experience, though it didn't actually become that big of a problem till college. The higher schooling and less-structured it is, the more of an issue it'll become.
I would urge it to be dealt with as early as possible, so you don't run into the same issues that I had since it went untreated.