Metformin hydrochloride as a basic drug for the treatment of diabetes, can be used to treat type 1 diabetes and type 2 diabetes, gestational diabetes can also be applied in accordance with foreign guidelines. At present, there are mainly two types of metformin on the market, domestic and imported. Metformin is imported in two dosage forms, 0.5g and 0.85g, 30-40 yuan per box, usually 30 tablets per box. Domestic metformin has two dosage forms, there are 0.5g and 0.25g, 0.25g enteric tablets is the cheapest, the general price is not more than 10 yuan; 0.5g metformin is metformin extended release tablets, the current price on more than ten dollars a box, so the price of different manufacturers and dosage forms are not the same.