Since insulin is the only hormone that lowers blood sugar, the main danger comes from hypoglycemia when there is an overdose of insulin in the body. When blood glucose drops to 2.8 mmol/L, the patient begins to experience a series of symptoms of sympathetic excitation and central nervous system dysfunction, and in severe cases, coma or even death can occur. If you overdose insulin injection, you must act to deal with hypoglycemia. 1. Once the symptoms of hypoglycemia appear, you should quickly eat at least 10 to 1 5 grams of rapidly absorbable carbohydrates, such as 3 to 5 pieces of candy, 2 to 3 teaspoons of table sugar, a glass of sugary juice, or even white sugar water or drinks with high sugar content (Sprite, cola), etc., to stop the development of hypoglycemia. Repeat within 15 minutes if necessary. 2.If there is a long time (more than 1 hour) before the next meal for hypoglycemia attack, after correcting hypoglycemia, a small amount of slowly absorbed food, such as half a loaf of bread, a few cookies or a small piece of bun, should be eaten. 3.If the symptoms of hypoglycemia cannot be relieved or coma appears even after eating, the patient needs to be sent to the hospital emergency room as soon as possible and the medical staff should be told about the patient’s medication. After the patient is revived by resuscitation, he should eat some sweet food or pastry, decide whether to discontinue insulin according to the actual situation, and observe the blood sugar situation for 2 to 3 days (elderly patients should pay particular attention to this point). Then adjust insulin dose and dosage according to blood sugar and diet. Common causes of insulin overdose: 1. Inaccurate dose when drawing insulin with a syringe or mistaken insulin dose when using an insulin pen. 2.Misuse of syringe to draw concentrated insulin dedicated to insulin pen. 3.Not eating in time after insulin injection, or insisting on insulin injection even when eating less, not being able to eat, nausea and vomiting due to some reasons. 4.Mistake insulin dosage form, common in insulin intensive therapy patients mistakenly injected short-acting insulin to medium-acting insulin. 5, mistakenly injecting insulin as other drugs.