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CIWA-Ar (Clinical Institute Withdrawal Assessment for Alcohol, revised scale) n. a scale consisting of a series of symptoms rated from 0 (not present) to 7 (most extreme), the cumulative score of which provides the basis for treatment of patients undergoing alcohol withdrawal. Medication is optional for patients with a score of 8–14, a score of over 15 requires treatment with chlordiazepoxide, and a score of over 20 poses a strong risk of delirium tremens.