Calcium moderates nerve and muscle performance via action potential excitation threshold regulation. Calcium citrate combines with dietary phosphate to form insoluble calcium phosphate which is excreted in feces and reduces phosphate absorption.
Hypersensitivity to any component of the formulation. Hypercalcemia. Renal calculi. Ventricular fibrillation.
Warnings and precautions
Constipation, bloating, and gas are common with calcium supplements (especially carbonate salt). Calcium absorption is impaired in achlorhydria (common in the elderly). Hypercalcemia and hypercalciuria are most likely to occur in hypoparathyroid patients receiving high doses of vitamin D. Use caution when administering calcium supplements to patients with history of kidney stones or renal failure. Calcium administration interferes with absorption of some minerals and drugs. It is recommended to administer vitamin D concomitantly for optimal calcium absorption. Taking calcium (≤500 mg) with food improves absorption.