A 58-year-old man is admitted to the medical ward for cellulitis of the left leg and started on IV cefazolin. On hospital day 3 he becomes agitated, disoriented to place and time, diaphoretic and tremulous, and says he sees insects crawling on the bed sheets. His wife reports that he drinks about 12 beers a day and had his last drink 3 days ago. He takes no regular medications and has no known allergies. On examination he has a gross tremor of both hands and no focal neurological deficit, and the cellulitis is improving. His CIWA-Ar score is 24. Investigations show: glucose 5.4 mmol/L (3.9-7.8), potassium 3.2 mmol/L (3.5-5.0), magnesium 0.58 mmol/L (0.70-1.10), AST 38 U/L (10-40), ALT 33 U/L (10-40), platelets 245 x 10^9/L (150-400) and INR 1.0 (0.9-1.2). CT of the head is unremarkable.
| Heart rate | 128/min |
| Respiratory rate | 22/min |
| Temperature | 38.2 °C |
| O2 saturation | 96%, room air |
| Blood pressure | 168/98 mm Hg |
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Which of the following are the most appropriate initial medications?
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