Circuit breakers for addiction.

The phenomenon of addiction is complex, although its expression clinically is relatively straightforward. There is a series of neurophysiological changes that mediate changes in the mesolimbic and mesocortical systems which in turn lead to disturbances in reward mechanisms. These then act to perpetuate the cycle of intoxication and reinforcement, withdrawal, craving and compulsive use. As our understanding of the pathophysiology of this process has improved, new pharmacological agents have been developed with the potential to moderate or even reverse it. This article briefly reviews the treatment of addiction with particular reference to emerging pharmaceutical agents.