Drug addiction is a medical disease characterized by biochemical changes in brain chemistry that play a significant role in the physical symptoms of addiction, including cravings, seeking, withdrawal, and the persistent use even in the face of negative consequences. Whatever the drug of choice, its abuse can be identified by the maladaptive way in which it takes over the user's life, disrupting his or her relationships, daily functioning, and mental state. Drug addiction can be physical and/or psychological. Physical addiction characterized by tolerance and withdrawal, while psychological dependence consists of the user's need of the drug to maintain mental well-being. The signs and symptoms of drug addiction are tolerance, withdrawal, inability to stop using, preoccupation with using, giving up of or reducing activities that were once enjoyable, failure to
Cited: Retrieved April 12, 2007 from source. Davison, Gerald C., Johnson, Sheri L., Kring, Anna M., & Neale, John M. (2007). Abnormal Psychology: the Tenth Edition National Institute of Drug Abuse. (2005). Research Report Series – Therapeutic Communities Abuse. Retrieved April 12, 2007, from the World Wide Web: http://www.drugfree.org/Intervention/ Watson, E., & Aronofsky, D. (2000). Requiem for a Dream. United States: Artisan Entertainment.