When managing a patient's risk for lithium toxicity, which information is important to communicate to the patient?

Maintaining adequate hydration and a consistent salt intake is crucial for patients on lithium therapy. Lithium levels in the blood can be affected by fluid intake and sodium levels; dehydration or a decreased sodium intake can lead to increased lithium reabsorption in the kidneys, thereby raising the risk of toxicity. Encouraging patients to drink enough fluids, especially during hot weather or when exercising, ensures proper hydration and balances electrolytes that help the kidneys effectively clear lithium from the body. Moreover, a steady intake of dietary sodium is essential, as fluctuations can similarly impact lithium levels; both dehydration and a low-sodium diet can lead to an increased risk of accumulating lithium, potentially resulting in toxicity.