Interesting article by Penelope on the trade-off's of treating ADHD by Penelope Trunk. entitled, Will Taking Drugs Help Your Career? Maybe you need Adderall?
The article talks about the focus that can be achieved using ADHD drugs, but the down-side in terms of the creative impact:
“Cognitive psychologists have found that there is a trade-off between attentional focus and creativity,” says Martha Farah, director of the Center for Cognitive Neuroscience. “There is evidence that individuals who are better able to focus on one thing and filter out distractions tend to be less creative.”
I've seen this in my own life as I've started taking med's for ADHD. The upside is that I can get a lot done in a very focused amount of time.