Smart Drugs

"Many people already use Provigil to cope with night-shift work, jet lag and lack of sleep, and suffer few side-effects. Others use beta-blockers to overcome the anxiety and stress of performance. Scientists use off-label drugs to increase their focus. If that helps them unravel the mysteries of the universe, so much the better. If chemical assistance can help increase the useful human lifespan, the benefits could be huge."

http://www.economist.com/PrinterFriendly.cfm?story_id=11412603

I wonder what the "off-label drugs to increase their focus" are.