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Longman Dictionary of Contemporary English
drug rehabilitation
noun
EXAMPLES FROM CORPUS
▪ But neighbors say she had gone through drug rehabilitation before and had relapsed in recent weeks.
▪ He spent three days in jail after smashing up an apartment, and has done time in a drug rehabilitation centre.
▪ Recommend that he get involved in some kind of drug rehabilitation program.
▪ The part-time actor was sentenced last month to a year in a tough drug rehabilitation unit on associated charges.
▪ We need only to cite schools and colleges, hospitals, drug rehabilitation centers, libraries and the like.
Wikipedia
Drug rehabilitation

Drug rehabilitation (often drug rehab or just rehab) is a term for the processes of medical or psychotherapeutic treatment, for dependency on psychoactive substances such as alcohol, prescription drugs, and street drugs such as cocaine, heroin or amphetamines. The general intent is to enable the patient to cease substance abuse, in order to avoid the psychological, legal, financial, social, and physical consequences that can be caused, especially by extreme abuse. Treatment includes medication for depression or other disorders, counseling by experts and sharing of experience with other addicts. Some rehab centers include meditation and spiritual wisdom in the treatment process. A few centers also treat gambling with the same techniques as are used in drug rehabilitation.