Pre-diabetics can take metformin orally completely, especially for prediabetics who are obese or of medium size. Because metformin has the effect of improving islet resistance and reducing body weight, it has a very good therapeutic effect on prediabetes. Therefore, in clinical practice, it is generally recommended that patients with prediabetes can take oral metformin for early intervention to bring their blood glucose levels down to the normal range. In addition to metformin, patients can also choose to take oral glycosidase inhibitors, such as acarbose and other drugs, which have also been proven to be very beneficial to the control of blood sugar in prediabetes.