A patient takes 300 mg of lithium carbonate 4 times a day. The serum lithium level yesterday was 1.8 mEq/L. The nurse should:
1. continue administering the drug as prescribed.
2. increase the dose to 450 mg.
3. decrease the dose to 150 mg.
4. hold the next dose and notify the prescriber.
Correct Answer: 4
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