A patient on lithium therapy presents with coarse tremor, polyuria, and confusion. Serum lithium level is 2.4 mEq/L. The NP's priority action is:
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A
Reduce the dose and recheck in one week
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B
Hold lithium and refer to the emergency department immediately
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C
Switch to valproate and monitor
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D
Increase fluid intake and recheck in 48 hours