A nurse is teaching a client who has bipolar disorder about lithium. Which of the following statements should the nurse include in the teaching?

A. Lithium is not considered addictive in the traditional sense, and it does not need to be discontinued after six months unless clinically indicated. B. Diuretics are generally avoided in patients taking lithium due to the risk of lithium toxicity from altered renal clearance, rather than being a routine prescription for difficulty urinating. C. Close monitoring of lithium levels is crucial to avoid toxicity and ensure therapeutic efficacy, making this statement correct and essential for the patient’s education. D. While weight gain can occur with lithium therapy, it is not an indicator of lithium toxicity; symptoms of toxicity include nausea, tremors, and confusion rather than weight gain.