Sodium chloride has the role of dissolving medicines, replenishing fluids to maintain water-electrolyte balance, flushing clean and replenishing blood volume; sodium chloride, also known as saline, contains sodium and chlorine ions; strict aseptic operation is required for its use. 1. Dissolve medicines: dissolve various antibiotics such as cefuroxime and other matching infusion, dissolve and dilute nebulized medicines such as budesonide and terbutaline, etc.; open the bottle and apply within 24 hours. 2. Rehydration to maintain water-electrolyte balance: for various causes of dehydration and low-sodium conditions such as hypotonic, isotonic, hypertonic, hyponatremia and hypochloremic metabolic alkalosis. 3. Flushing and cleansing: used for all kinds of wounds, infection surgery such as appendicitis surgery, eye and external ear canal flushing and cleaning the nasal cavity. 4.Supplementary blood volume: used in anaphylaxis and hypovolemic shock rescue. If there is any discomfort, it is recommended that the patient go to the regular hospital for consultation and treatment, and should not blindly deal with it by themselves in order to avoid delaying the condition.