Vitamin D intoxication (VDI) is usually iatrogenic and is due to the usage of improper doses of vitamin D. Serum 25OHD levels above 120 nmol/l are considered Vitamin D intoxication. Vitamin D intoxication has been reported more frequently in recent years. The symptoms and findings associated with VDI are closely related to serum calcium concentration. Emergency intervention is necessary because of the adverse effects of hypercalcemia on cardiac, neurologic, renal, and gastrointestinal functions.We present a previously healthy, 13-month-old infant with severe and resistant hypercalcemia due to unconscious overdose with vitamin D supplement and its successful treatment with intravenous infusion of pamidronate with no complications

Keywords: Hypercalcemia, Intoxication, Vitamin D