Because alcohol is addictive - just like any other drug. The patient's body craves a 'fix' of alcohol, and if they don't get it, they get withdrawal symptoms - just as a heroin addict would without their fix. A Detox unit would gradually wean the patient off alcohol under supervision - over a period of weeks - perhaps months. The alcohol is replaced with supervised medication to reduce the effects of withdrawal, and 'trick' the body into thinking it's still getting the alcohol. Medication is gradually reduced until the patient is alcohol free.
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