Addiction Medicine
CIWA-Ar (Alcohol Withdrawal)
Severity of alcohol withdrawal.
Education and reference only. Not a substitute for clinical judgement, local policy or product labelling. Always verify before clinical use. Values are calculated in your browser and never stored.
Background
The revised Clinical Institute Withdrawal Assessment for Alcohol (CIWA-Ar) is a 10-item scale that quantifies the severity of alcohol withdrawal. Nine items (nausea/vomiting, tremor, sweats, anxiety, agitation, and tactile, auditory, visual and headache disturbances) are each scored 0–7, while orientation/clouding of sensorium is scored 0–4, giving a maximum of 67. It is repeated at intervals to track withdrawal over time. The scale underpins symptom-triggered benzodiazepine regimens, in which treatment is given according to the score rather than on a fixed schedule.
Interpreting the result
A score of 0–9 indicates minimal or absent withdrawal, 10–19 moderate withdrawal and 20 or more severe withdrawal. Many protocols give a benzodiazepine when the score reaches a threshold of around 8–10 and then reassess. Scores above 20 carry a higher risk of withdrawal seizures and delirium tremens and should prompt escalation of care and closer monitoring.
Advice
Many protocols give benzodiazepines for scores ≥8–10 and reassess regularly. Severe scores (>20) carry a higher risk of seizures and delirium tremens — escalate care.
Worked example
A patient one day after their last drink has moderate tremor (4), paroxysmal sweats (3), anxiety (4), mild agitation (2), tactile disturbance (2) and is disoriented to date by one day (2), totalling 17. This is moderate withdrawal, prompting symptom-triggered treatment and reassessment within the local protocol.
Pearls / pitfalls
- It is unreliable when the patient cannot communicate or is confused from another cause (head injury, sepsis, encephalopathy) — do not attribute a high score to withdrawal without considering alternatives.
- It assesses severity, not the diagnosis: confirm the patient is genuinely in alcohol withdrawal before using it to drive treatment.
- Symptom-triggered protocols need staff trained to score reliably and frequently; without that, fixed-dose regimens may be safer.
- Always give thiamine to prevent Wernicke's encephalopathy and look for co-existing problems such as infection, bleeding or electrolyte disturbance.
Evidence & validation
The revised scale was published by Sullivan and colleagues in 1989 and validated against earlier instruments. Symptom-triggered dosing guided by CIWA-Ar has been shown in trials to reduce total benzodiazepine use and treatment duration compared with fixed schedules, and it is widely endorsed in addiction and acute-medicine guidance.
Frequently asked questions
What CIWA-Ar score needs treatment?
Many protocols start treatment at a score of around 8–10 and then reassess, but local thresholds vary. The score guides symptom-triggered dosing rather than replacing clinical judgement.
What score indicates severe withdrawal?
A score of 20 or more indicates severe withdrawal, with a higher risk of seizures and delirium tremens. These patients need closer monitoring and escalation of care.
Can I use CIWA-Ar in a confused or non-communicative patient?
It is unreliable in that setting because several items rely on the patient's report. Confusion from another cause can mimic a high score, so look for alternative explanations.
What is symptom-triggered dosing?
Medication is given according to the CIWA-Ar score at each assessment rather than on a fixed timetable. Trials suggest this reduces total medication and treatment time when staff can score reliably.
Does a normal CIWA-Ar mean no risk of complications?
No. Seizures and Wernicke's encephalopathy can occur even with low scores, so thiamine and clinical vigilance remain important regardless of the number.
References
- Sullivan JT, Sykora K, Schneiderman J, et al. Assessment of alcohol withdrawal: the revised Clinical Institute Withdrawal Assessment for Alcohol scale (CIWA-Ar). Br J Addict. 1989;84(11):1353–1357.
- NICE CG100: Alcohol-use disorders: diagnosis and management of physical complications. 2010 (updated).
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