A 38-year-old woman with bipolar disorder type I has been on lithium 900 mg daily for 6 months with good mood stabilization. She now presents with polyuria (3 L/day), polydipsia, and serum sodium 148 mEq/L. Serum lithium level is 0.8 mEq/L (therapeutic range). Urine osmolality is 180 mOsm/kg. What is the most appropriate next step in management?

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