Carbamazepine overdose presenting as a diabetes insipidus like condition in a child

Carbamazepine is a commonly used antiepileptic medication. In overdoses it can produce various side effects involving neurological, cardiac, hematological and endocrinal systems. Inappropriate secretion of Anti Diuretic Hormone (ADH) is a well-known complication of carbamazepine toxicity. We are reporting an unusual complication in an adolescent girl with intentional carbamazepine overdose. A sixteen year old female with carbamazepine ingestion presented to our hospital with altered sensorium. On admission she was found to have a very high serum carbamazepine level and metabolic acidosis. In contrast to the possible inappropriate secretion of ADH, as an adverse effect of carbamazepine, her hospital course was complicated with a diabetes insipidus - like condition following treatment with multiple doses of activated charcoal and sodium bicarbonate therapy.