Most cases of hypercalcaemia are secondary to malignancy or primary hyperparathyroidism. We report a patient presenting with a triad of hypercalcemia, metabolic alkalosis, and renal failure secondary to treatment of iatrogenic hypoparathyroidism and osteoporosis. Persistent ingestion of calcium carbonate and vitamin D caused milk-alkali syndrome. The patient was managed with intravenous fluids and withdrawal of calcium carbonate and vitamin D. She responded well to the treatment and the calcium concentration, renal function and metabolic alkalosis were normalized. Milk-alkali syndrome may be important as a reemerging cause of hypercalcemia.