cacl2 means calcium chloride. In clinical practice, calcium chloride is often used as a calcium supplement, widely used in the treatment of various diseases, such as hypocalcemia, allergic diseases, magnesium ion toxicity, cardiopulmonary resuscitation and so on. 1. Calcium chloride is mainly used for the treatment of hypocalcemia, increasing blood calcium concentration, relieving tetany caused by low calcium or rickets caused by vitamin D deficiency, and so on. 2. Calcium chloride can be used for the treatment of allergic diseases, such as anaphylactic purpura, allergic rash, oozing edema and so on. 3. Calcium chloride can be used for the relief of magnesium poisoning and fluorine poisoning. 4. Calcium chloride can also be used for cardiopulmonary resuscitation, such as arrhythmia caused by hyperkalemia and hypocalcemia. Calcium chloride is a prescription drug, and patients are advised to use the drug under the guidance of a doctor and in accordance with the doctor’s instructions.