“Calcium injection” refers to intravenous calcium preparations such as calcium gluconate and calcium lactate, which are mainly used for the treatment of low blood calcium and other diseases. Symptomatic and non-contraindicated use of the drug has certain benefits to the body; non-symptomatic use of the drug, contraindicated use of the drug, normal use of the drug, etc. may lead to physical damage. 1. Indications for intravenous calcium preparations such as calcium gluconate: symptomatic use of medication is conducive to the recovery of the disease and has certain benefits for the body’s health. (1) Acute hypocalcemia, alkalosis, hypothyroidism and other diseases caused by hand and foot convulsions. (2) Medication when rescuing magnesium, fluorine and other poisoning. (3) Protecting the heart in case of hyperkalemia. 2. Contraindications: The use of drugs in the presence of contraindications is harmful to the body and may even be life-threatening. (1) Allergy to drug components is prohibited. (2) Prohibited in hyperkalemia. (3) Co-administration with cardiac glycosides such as digoxin, citrates, phosphates, etc. is prohibited. (4) Renal insufficiency and respiratory acidosis are prohibited. (5) If skin redness, rash, pain and other manifestations occur during use, the drug should be stopped immediately. Normal people do not need to use the drug, normal people may have adverse reactions after using the drug, but also lead to hypercalcemia and other diseases, which is not good for the body. Whether need to use the drug, how to use the drug is recommended by the clinician comprehensive judgment, prohibit unauthorized use of the drug.