Symptoms and Treatment for Overdosage, and Antidote: Anorexia, lassitude, nausea, vomiting, polyuria, profuse sweating, headache and extreme thirst. Hypercalcemia may result in calcium deposits in many tissues, such as the arteries and kidneys, which lead to hypotension and renal failure. If symptoms arise discontinue administration of Calcium with Vitamin D and give large quantities of fluid and electrolytes. The patients should be placed on a low calcium diet. Cortisone rapidly reduces hypercalcemia in severe conditions.