Thin patients as far as possible do not take oral metformin, because metformin, a glucose-lowering drug, is mainly used for the basic treatment of diabetes, especially for obese patients with type 2 diabetes, because metformin has the effect of weight loss. Clinical see a lot of medium-sized or thin diabetic patients, oral metformin treatment, weight loss is more obvious, so generally do not recommend thin patients oral metformin. You can choose other hypoglycemic drugs, such as sulfonylurea hypoglycemic drugs and glucosidase inhibitors, can be very good control of blood sugar.