RT Journal Article SR Electronic T1 Hypervitaminosis D causing nephrogenic diabetes insipidus in a 5-month-old infant JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 187 OP 189 VO 34 IS 2 A1 Ihab A. Ahmad A1 Abdulmoein E. Al-Agha YR 2013 UL http://smj.org.sa/content/34/2/187.abstract AB Vitamin D intoxication in infancy leads to acute hypercalcemia and subsequent hypercalcuria with nephrocalcinosis. Strategies used for patients with vitamin D intoxication are unsatisfactory and associated with prolonged periods of hypercalcemia. We present a 5-month-old infant who had failure to thrive, refusal to feed, delayed motor development, truncal hypotonia, and dehydration. She had high plasma sodium and osmolality with low urine osmolality, and did not respond to intravenous desmopressin administration. She was diagnosed as nephrogenic diabetes insipidus due to hypercalcemia caused by hypervitaminosis D, and was treated with hydrochlorothiazide 2 mg/kg twice daily, and hydration.