Calcium carbonate is used to lower phosphorus and is taken 1 to 4 times a day. Normal human body, calcium and phosphorus mainly in the form of inorganic salts in the body, plasma calcium and phosphorus concentration to maintain a relatively constant, when the blood phosphorus increases when the blood calcium is reduced; blood calcium increases when the blood phosphorus is reduced. This relationship between calcium and phosphorus metabolism plays an important role in the calcification of bone tissue. Disorders of calcium and phosphorus metabolism are characterized by hypocalcemia, hypercalcemia, hypophosphatemia, and hyperphosphatemia. In hyperphosphatemia, the patient’s blood phosphorus is elevated, which directly stimulates the parathyroid glands to secrete parathyroid hormone, leading to a decrease in blood calcium. Therefore, the treatment of hyperphosphatemia requires calcium supplementation. Calcium carbonate is used for the prevention and treatment of calcium deficiencies, such as osteoporosis, tetany, osteogenesis imperfecta, rickets, as well as calcium supplementation for children, pregnant and lactating women, menopausal women, and the elderly. There are numerous calcium carbonate products. 0.75 grams of calcium phosphate, for example, usually requires 1 to 4 tablets per day, divided into 1 to 4 times, taken after meals. Adverse reactions such as belching (hiccups) and constipation can occur during the administration of calcium carbonate. It is contraindicated in patients with hypercalcemia, hypercalciuria, calcium-containing kidney stones, or a history of kidney stones. Calcium carbonate is used to reduce phosphorus, need to follow the doctor’s instructions to avoid overdose of adverse health conditions.