An unusual cause of hyponatraemia

Hyponatraemia is a common medical problem in out-patient clinics and in hospitalised patients. Severe hyponatraemia (serum sodium of < 120 mEq/l) is associated with life-threatening complications. Diabetes Insipidus (DI) due to either vasopressin deficiency or resistance of kidney tubules usually causes hypernatraemia. We present a case of DI who had persistent hyponatraemia in a hospital setting for more than 12 days before the self use of Desmopressin (DDAVP) spray assumed to be Fluticasone was found to be the reason of hyponatraemia.