What is the expiry date of insulin after opening

The validity period of insulin is one month after it is unsealed. It can be used together with an insulin injection pen. After opening, put it in the insulin pen and store it at room temperature, not exceeding 30 ℃. Avoid direct sunlight and humid environment. If it is not used up for one month, it cannot be used again. Insulin without opening is generally valid for 30 months. It should be stored at 2-8 ℃ in the refrigerated layer of the refrigerator. Be careful not to freeze, because insulin belongs to protein, and freezing will denature insulin and lose its hypoglycemic effect. Before application, take it out of the refrigerator and place it at room temperature for a period of time. Inject insulin when the temperature is close to room temperature to avoid skin irritation. During injection, pay attention to the disinfection of the skin at the injection site, rotate the injection site, and replace one needle for injection at a time.