Patients with gestational diabetes who have poor glycemic control with diet and exercise alone need insulin. Generally, gestational diabetes patients are required to have a 2-hour postprandial blood glucose of less than 6.7 mmol/L. Therefore, a 2-hour postprandial blood glucose of 8 mmol/L indicates that the blood glucose control is not up to the standard, and it is necessary to comply with the doctor’s prescription for treatment. Some patients with gestational diabetes mellitus can achieve satisfactory glycemic control with strict diet and exercise therapy. However, for those who are not well controlled by diet and exercise alone, human insulin (short-acting, intermediate-acting and premixed human insulin) and insulin analogs (Mentholatum, Lysostaphin and Ditropan) can be chosen for treatment. Insulin is the first choice for glucose-lowering drugs during pregnancy. Insulin injection may cause hypoglycemia, allergic reactions and other adverse reactions, and you should consult your doctor in time for any abnormality that occurs after using the drug. Insulin needs to be used under the guidance of a doctor.