Mentholated insulin takes effect within 10 to 20 minutes after subcutaneous injection, and must generally be injected immediately before a meal, or immediately after a meal if necessary. Mentholated insulin is a fast-acting insulin mainly used for the treatment of diabetes mellitus and diabetic complications (e.g. diabetic ketoacidosis, diabetic nephropathy, etc.). It has a short onset of action within 10-20 minutes after subcutaneous injection, and is usually administered as a preprandial injection, or immediately after a meal. Mentholatum is contraindicated in patients who are allergic to insulin or any other ingredient contained in this product, and is contraindicated in the event of hypoglycemia. Mentholated insulin should be used strictly under medical supervision. In the event of adverse reactions such as panic, tremor, shock, etc., the drug should be stopped immediately and go to the hospital for treatment.