Clinically, the general concept of gestational diabetes includes two kinds, one is diabetes in pregnancy, and the other is gestational diabetes. Regardless of the situation, in pregnancy sugar-lowering treatment for both doctors and family members is something that needs to be careful, one is concerned about the impact of side effects on the fetus, but also the safety of pregnant women. That is to say, in the use of drugs not only need to take into account the effect of lowering sugar, but also to consider whether the impact on the fetus, at the same time need to pay attention to prevent the occurrence of hypoglycemia. Therefore, for pregnant diabetic patients, doctors need to balance between controlling blood glucose and preventing hypoglycemia, and choose medications according to the individual patient’s situation. The most common clinical method is insulin therapy, but due to multiple injections, the dosage is not easy to control, so it is easy to cause frequent hypoglycemia or hyperglycemia, which may cause adverse effects on the development of the fetus. The use of insulin analogs for hypoglycemic treatment is safer. Among the many varieties of insulin analogs, what are the insulin analogs approved for use in pregnant patients? 1. Menthol insulin of the short-acting class 2. Diltiazem insulin of the long-acting class.