The expiration date of a drug is the period during which the drug can be kept in good quality under certain storage conditions. Therefore, whether the expired drugs can be eaten depends on whether the drugs are stored in strict accordance with the storage conditions in the drug instructions. If the drugs are stored in strict accordance with the storage conditions in the drug instructions, the expired drugs can be eaten, there are several storage conditions: such as refrigeration, in general, is placed in the refrigerator freezer 2-8 ℃ storage. But there is a special is that if the unused insulin is recommended to be stored at 2-8℃, if the insulin is used, it is recommended to be stored at room temperature, and the said room temperature is 10-30℃.