A client is currently taking lithium carbonate. The nurse should include which teaching?

Rationale: A. Administer calcium supplements with the evening meal: Calcium supplementation does not have a significant impact on lithium therapy or toxicity. Advising calcium intake is not relevant to lithium management and does not prevent adverse effects or support therapeutic levels. B. Ensure adequate sodium intake at every meal: Lithium is a sodium analog, and its excretion is closely linked to sodium levels. Low sodium intake can decrease lithium excretion, leading to toxicity, while very high sodium intake can reduce its effectiveness. Maintaining consistent sodium intake helps stabilize serum lithium levels and prevents dangerous fluctuations. C. Increase water intake to three liters per day: While adequate hydration is important to reduce the risk of lithium toxicity, recommending a fixed volume of three liters daily may not be individualized or necessary for all clients. Fluid intake should be balanced based on activity, climate, and health status. D. Increase potassium intake by eating bananas: Potassium intake does not directly affect lithium levels. While maintaining overall electrolyte balance is important, focusing specifically on potassium-rich foods is not a primary teaching point for clients on lithium therapy.