[WhoIam]

Adderall will do wonders for your game, especially if you naturally have trouble concentrating. It's actually quite safe provided you use it intelligently (i.e. take a normal prescription dose, don't snort it, don't do it all the time, don't combine it with other stimulants). If you take it every day, you will become physically (and almost certainly psychologically) addicted to it. Ephedrine is like adderall but legal, just not as fun or effective.

Edit: Adderall used to be a diet pill, so if you're naturally thin like I am, try to eat some high-calorie foods. Also, you may take it and then get totally wrapped up in something else and forget about the poker you should be playing.