1. Which mood stabilizer is most likely to cause hyponatremia? Carbamazepine (brand name Tegretol) and oxcarbazepine (brand name Trileptal) can both cause hyponatremia due to syndrome of inappropriate ADH secretion (SIADH). It is not a deficiency of sodium. It is because due to excessive antidiuretic hormone the kidneys are retaining too much water. Due to excessive…