Antiepileptics · Pharmacology

A patient taking Carbamazepine develops severe hyponatremia. This is primarily due to which of the following?

  1. Markedly increased renal excretion of sodium
  2. Syndrome of inappropriate antidiuretic hormone secretion
  3. Inhibition of aldosterone synthesis in the adrenal cortex
  4. Osmotic diuresis from glucose loss
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Correct answer: Syndrome of inappropriate antidiuretic hormone secretion

Carbamazepine can increase the sensitivity of the renal collecting ducts to ADH or stimulate its release. This leads to water retention and dilutional hyponatremia, which requires monitoring of serum electrolytes in treated patients.

Difficulty: Medium Question 7 of 20

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