Drug rehabilitation is an umbrella term for a variety of processes by which a person addicted to a drug stops using that drug. These processes can vary from cold turkey to the use of substitute drugs which do not have the same action upon the state of conciousness as the original drug to which the person was addicted.

Many drug rehabilitation programs include attempts to change the patient's behavior. In particular, patients are generally encouraged or required not to associate with friends who still use the addictive substance. Twelve-step programs encourage addicts not only to stop using alcohol or other drugs, but to examine and change habits related to their addictions.

Drug rehabilitation is sometimes part of the criminal justice system. People convicted of minor drug offenses may be sentenced to rehabilitation instead of prison, and those convicted of driving while intoxicated are sometimes required to attend Alcoholics Anonymous meetings.

See also