Preliminary research in healthy men suggests that the narcolepsy drug modafinil, increasingly being used to enhance cognitive abilities, affects the activity of dopamine in the brain in a way that may create the potential for abuse and dependence, according to a study in the March 18 issue of JAMA.

Link:http://www.eurekalert.org/pub_releases/2009-03/jaaj-dbu031209.php
Source:EurekAlert