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I believe Paul Philips uses adderall, somebody correct me if I've slandered him.

Those who've used it say its very helpful for concentration and focus, and that poker-wise they feel like it helps them play at their A-game past a point where fatigue might ordinarily start affect them.

--Zetack

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This is 100% true. Adderal is essentially speed. Im not prescribed it, so I don't know if it has such an intense effect on those that "need it". However, one adderall allows me to play 14 hour sessions like its nothing ( i only do this when I go a casino) without getting too fatigued or drunk.