Tehran University of Medical Sciences Journal of Pharmaceutical Care 2322-4630 1 3 2015 10 10 114 116 EN Mohammad Bagher Oghazian Clinical Pharmacy Department, Faculty of Pharmacy and Pharmaceutical Sciences, Tehran University of Medical Sciences, Tehran, Iran AND Pharmaceutical Care Department, Dr. Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran. Sara Ataei Pharmaceutical Care Department, Dr. Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran. Mania Radfar Clinical Pharmacy Department, Faculty of Pharmacy and Pharmaceutical Sciences, Tehran University of Medical Sciences, Tehran, Iran. 2015 10 10 2015 10 10 We describe a patient with hypercalcemia associated with the injection of high doses vitamin D as supplement for a period of six months. A 76-year-old woman had been taking an intramuscular injection of vitamin D 300,000 IU every ten days for six months. She was hospitalized with symptoms of hypercalcemia: chronic constipation, unstable gait, a chronic generalized musculoskeletal pain and increased fatigue. On admission her 25 (OH) vitamin D and Calcium levels were 559 nmol/L and 13.85 mg/dL respectively, and Parathyroid Hormone (PTH) level was 7.1 pg/mL. Immediately she received diuresis therapy with saline and furosemide in conjunction with calcitonin and pamidronate. At discharge her serum calcium level was 11.5 mg/dL. To lower endogenous overproduction of calcitriol, prednisolone 20 mg/day for 10 days was administered at discharge time. https://jpc.tums.ac.ir/index.php/jpc/article/view/25 https://jpc.tums.ac.ir/index.php/jpc/article/download/25/25