Calcium carbonate D3 tablets is a calcium supplement, which is a compound preparation composed of calcium carbonate and vitamin D3, and is an over-the-counter drug. Calcium is essential for maintaining the normal function of the human nerve and musculoskeletal systems, cell membranes and capillary permeability. Vitamin D3 is involved in the metabolism of calcium and phosphorus in the body and promotes their absorption, as well as the formation of bone, so the compound preparation composed of calcium and vitamin D3 can well prevent and treat calcium deficiency and osteoporosis. This drug is used clinically for calcium supplementation in pregnant and lactating women, menopausal women, and the elderly, and to help prevent osteoporosis with significant efficacy. Calcium carbonate D3 tablets should be used with caution in patients with constipation, bloating and other gastrointestinal adverse reactions, as well as in patients with cardiac or renal insufficiency. Patients with hypercalcemia are not allowed to use this drug. Patients with calcium-containing kidney stones or kidney stone disease should use this drug under medical supervision.