Prior to being diagnosed with ADHD, I had just dropped out of undergrad after failing a number of courses. After starting meds, (and having cognitive behavioral therapy), I returned to school and graduated with a GPA a hair under 4.0, while being involved with a volunteer SAR team. Without treatment, I never would have been able to complete a post-graduate education, either. I remain on the same medication at the same dose that was started 11 years ago. This is essentially the fairy-tail result of finding the right med. I am by no means “asymptomatic”, but I am able to function at a level where my average co-worker can’t tell that I struggle with executive dysfunction. On days I don’t take the meds, or when I’ve had to go without, I don’t experience withdrawal. My focus and motivation, of course, become abysmal.
There are also a few non-stimulant meds out there for management of ADHD, but I have no personal experience with them.