A 52-year-old man with a 20-year history of alcohol dependence presents to the emergency department with tremors, diaphoresis, tachycardia, and agitation 18 hours after his last drink. He has no prior seizures or delirium. What is the drug of choice for acute alcohol withdrawal management in this patient?

Explanation

## Acute Alcohol Withdrawal Management **Key Point:** Benzodiazepines are the gold-standard first-line agents for acute alcohol withdrawal, particularly for managing autonomic hyperactivity and preventing seizures and delirium tremens. ### Mechanism of Action Benzodiazepines potentiate GABA~A~ receptor signalling, counteracting the CNS hyperexcitability caused by chronic alcohol's suppression of GABA and enhancement of glutamate neurotransmission. ### Clinical Efficacy in Withdrawal | Feature | Benzodiazepines | Naltrexone | Disulfiram | Baclofen | |---------|-----------------|-----------|-----------|----------| | **Acute withdrawal** | ✓ First-line | ✗ No role | ✗ No role | ✗ Adjunct only | | **Seizure prevention** | ✓ Proven | ✗ No | ✗ No | ✗ No | | **Delirium prevention** | ✓ Proven | ✗ No | ✗ No | ✗ No | | **Autonomic stabilization** | ✓ Rapid | ✗ No | ✗ No | ~ Weak | | **Onset** | Minutes–hours | Days | Days | Hours | **High-Yield:** Lorazepam is preferred in severe liver disease (shorter half-life, no active metabolites); diazepam is preferred in milder cases (longer half-life allows less frequent dosing). Both are superior to short-acting agents like oxazepam in acute withdrawal. ### Dosing Approach - **CIWA-Ar protocol** (Clinical Institute Withdrawal Assessment for Alcohol Scale): Symptom-triggered dosing reduces total benzodiazepine exposure and duration of treatment. - Typical initial dose: lorazepam 2–4 mg IV/IM or diazepam 5–10 mg IV, repeated every 5–10 minutes until signs of withdrawal stabilize. **Clinical Pearl:** Benzodiazepines should be tapered over 5–7 days to prevent rebound withdrawal; abrupt discontinuation risks seizures. ### Why Benzodiazepines Are Superior 1. Prevent progression to seizures (occur in 5–15% of untreated withdrawal). 2. Prevent delirium tremens (mortality 5–15% if untreated). 3. Rapidly reverse autonomic hyperactivity (tremor, tachycardia, hypertension). 4. Safe, reversible, and well-tolerated in acute settings. [cite:Harrison 21e Ch 474]