The main function of glucose is to replenish energy and body fluids, and it can also be used in the treatment of hypoglycemia as well as hyperkalemia. 1. Supplementing energy: glucose is one of the main sources of calories in the body, so it has the function of supplementing calories. 2. Treating hypoglycemia: when blood glucose concentration is too low, it will lead to dizziness, fatigue, chest tightness, palpitation, cold sweat, pallor and so on, and the symptoms of hypoglycemia can be improved by taking glucose or injecting glucose intravenously. 3. Treatment of hyperkalemia: Glucose and insulin are injected intravenously at the same time, which can make potassium ions enter into the cells, and eventually the blood potassium concentration decreases. 4. Dextrose injection is also used as a diluent and can maintain and regulate the osmotic pressure of peritoneal dialysis fluid, so it can also be used to prepare peritoneal dialysis fluid. The most common adverse effect of treatment with dextrose is to cause an increase in blood glucose. Glucose is contraindicated in people with uncontrolled diabetic ketoacidosis, hyperglycemic nonketotic hyperosmolar states, and so on. Before choosing glucose therapy, it is important to use the medication as prescribed by your doctor.