A nurse is caring for a client who has bipolar disorder and is taking lithium. The client reports blurred vision and ataxia. Which of the following actions should the nurse take?

A. Administering the next dose as prescribed is not appropriate, as blurred vision and ataxia are signs of lithium toxicity, which requires immediate intervention. B. Withholding the medication is the correct action. Blurred vision and ataxia are early signs of lithium toxicity, and the nurse should withhold the medication and notify the provider to assess lithium levels and make necessary adjustments. C. Propranolol is used for conditions like hypertension or tremors, but it does not treat lithium toxicity. The priority is addressing the possible toxicity directly. D. Levothyroxine is used to treat hypothyroidism, which is a potential side effect of long-term lithium use, but it is not appropriate for managing acute symptoms like blurred vision and ataxia that may indicate lithium toxicity.