Lithium levels are influenced by sodium; which practice helps maintain therapeutic lithium levels?

Lithium levels are influenced by sodium; which practice helps maintain therapeutic lithium levels?

• A. Sodium levels do not affect lithium
• B. Maintain normal sodium intake
• C. Keep fluid restricted
• D. Avoid all salty foods

Answer: (B)

Lithium is eliminated by the kidneys, and its reabsorption follows sodium reabsorption. When sodium intake or serum sodium is low, the kidneys reabsorb more sodium (and lithium), raising lithium levels toward toxicity. If sodium intake is normal, lithium is excreted at a steady rate, helping keep it in the therapeutic range. Hydration matters too; dehydration concentrates lithium and can raise levels, while adequate fluids support stable excretion. Therefore maintaining normal sodium intake helps keep lithium within the desired range. In contrast, restricting fluids can raise lithium concentration, and avoiding all salty foods lowers sodium and can increase lithium reabsorption, both risking toxicity or subtherapeutic levels.

Lithium is eliminated by the kidneys, and its reabsorption follows sodium reabsorption. When sodium intake or serum sodium is low, the kidneys reabsorb more sodium (and lithium), raising lithium levels toward toxicity. If sodium intake is normal, lithium is excreted at a steady rate, helping keep it in the therapeutic range. Hydration matters too; dehydration concentrates lithium and can raise levels, while adequate fluids support stable excretion. Therefore maintaining normal sodium intake helps keep lithium within the desired range. In contrast, restricting fluids can raise lithium concentration, and avoiding all salty foods lowers sodium and can increase lithium reabsorption, both risking toxicity or subtherapeutic levels.