A 54-year-old male with a 25-year history of heavy daily alcohol use and biopsy-proven alcoholic cirrhosis (Child-Pugh class B, total bilirubin 3.2 mg/dL, albumin 2.6 g/dL, INR 1.7) presents 36 hours after his last drink with tremor, diaphoresis, tachycardia (HR 118), blood pressure 168/98 mmHg, and a CIWA-Ar score of 18. Which benzodiazepine is the preferred first-line agent for his alcohol withdrawal?

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✅ D. Lorazepam (Ativan)
In patients with significant hepatic impairment — cirrhosis, severe alcoholic hepatitis, Child-Pugh B or C — lorazepam is the preferred benzodiazepine for alcohol withdrawal. Lorazepam is one of the "LOT" benzodiazepines (Lorazepam, Oxazepam, Temazepam) that undergo only phase II glucuronidation rather than phase I cytochrome P450 oxidation. Glucuronidation is relatively preserved in cirrhosis, whereas CYP-mediated oxidation is markedly reduced. Lorazepam also has NO active metabolites, so there is no risk of accumulation leading to prolonged sedation, confusion, or precipitated hepatic encephalopathy. A typical regimen is symptom-triggered dosing using CIWA-Ar (e.g., lorazepam 2 mg IV/PO every 1 to 2 hours for CIWA ≥ 8 to 10).

❌ A. Chlordiazepoxide (Librium)
Chlordiazepoxide has a long half-life and multiple long-acting active metabolites (desmethyldiazepam among others) that are CYP-oxidized. In cirrhosis these accumulate and can cause oversedation and precipitate hepatic encephalopathy. It is an excellent choice for alcohol withdrawal in patients WITHOUT liver disease (smooth self-taper), but not for this patient.

❌ B. Diazepam (Valium)
Diazepam is also CYP-oxidized with very long-acting active metabolites. Although its long half-life produces a smooth self-taper that is useful in uncomplicated alcohol withdrawal, it accumulates dramatically in hepatic impairment. Not appropriate for Child-Pugh B or C.

❌ C. Alprazolam (Xanax)
Alprazolam is never used for alcohol withdrawal. Its short half-life causes erratic sedation with rebound withdrawal between doses, and its high abuse potential is especially problematic in a patient with an active substance use disorder.

:::pearl
The "LOT" benzos — Lorazepam, Oxazepam, Temazepam — are glucuronidated only, have no active metabolites, and are the only safe benzodiazepines in hepatic impairment. For alcohol withdrawal: lorazepam is preferred in cirrhosis and in the elderly; chlordiazepoxide or diazepam is preferred in otherwise healthy adults because the long half-life creates a smooth self-taper.
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Lorazepam

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