A 52-year-old man with a 20-year history of alcohol dependence presents to the emergency department 36 hours after his last drink. He is tremulous, diaphoretic, and agitated. His wife reports he has been confused and seeing things that are not there. Vital signs: BP 148/92 mmHg, HR 110 bpm, temperature 38.2°C, RR 22/min. On examination, he is disoriented to time and place. What is the most appropriate immediate pharmacological intervention?

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