Lit Matters 1: Phenobarb vs. Benzos for ETOH Withdrawal

Alcohol withdrawal has a high short-term ED bounceback rate, and the choice of phenobarbital versus benzodiazepines may change who returns within a week. This review centers on discharged ED patients with ethanol withdrawal, where underdosed benzodiazepines may be part of the story.

Alcohol Withdrawal Return Visits

• Short-term recidivism signal: Among discharged ED patients with alcohol withdrawal, phenobarbital-treated patients had fewer 3-day and 7-day return visits than those treated with benzodiazepines alone.
• Headline return rates: The gap was clinically large: 3-day returns were 25% with benzodiazepines versus 13% with phenobarbital, and 7-day returns were 38% versus 18%.
• Combination therapy pattern: Phenobarbital plus other agents also outperformed benzodiazepines alone, with no clear advantage over phenobarbital by itself, a nuance we get into in the episode.
• Dose equivalence concern: Average benzodiazepine dosing looked light compared with the phenobarbital exposure delivered, supporting the concern that underdosed lorazepam may partly explain the bounceback difference.
• Withdrawal-driven revisits: Most return encounters were still alcohol-related, with 92 of 120 revisits tied to withdrawal or intoxication rather than an unrelated complaint.
• Discharge safety caveat: Phenobarbital's long half-life raises a real outpatient safety question after ED discharge, especially if patients resume alcohol or benzodiazepines; we cover the patient-selection tension on the show.

References:

1. Hendey GW, Dery RA, Barnes RL, Snowden B, Mentler P. A prospective, randomized, trial of phenobarbital versus benzodiazepines for acute alcohol withdrawal. Am J Emerg Med. 2011 May;29(4):382-5. doi: 10.1016/j.ajem.2009.10.010. Epub 2010 Mar 25. PMID: 20825805.