A 52-year-old man with bipolar disorder has been on lithium 900 mg/day for 3 years with good mood stabilization. He presents to the emergency department with confusion, coarse tremor, ataxia, and diarrhea. Serum lithium level is 2.8 mEq/L (normal: 0.6–1.2 mEq/L). What is the drug of choice for acute management of his lithium toxicity?

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