I am not a doctor (and I don't play one on TV), but everything I have heard about Adderall is that the gains are offset by massive losses in other areas. For those who are lucky enough (or medicated enough in other ways) it may pay off, but I don't see much positive from it - even though I am sure there is.
Generally keeping your mind busy works. When I was 16-20, I generally did 3 things at a time, even when relaxing, like watch TV, listen to music, and read. It would be enough to drive most normal people batty, but it worked out. Later in life I have learned how to control it better, but there are still some days it doesn't work.
In live poker I tend to concentrate on one or more players movements and actions, trying to micro analyze them. I particularly like reading the players who work very hard to be unreadable, because the victory of spotting their tell is worth it.
Side note: watch people's hands. Most people will endlessly play with their chips, but when they hit a hand (or are under stress) it's the first place that shows it. Paying attention when you are NOT in a hand it worth it, and perhaps a good distraction.