The generic name of the drug Metformin Hydrochloride Extended-Release Tablets is Metformin Hydrochloride Extended-Release Tablets, and according to its instructions for use of the drug, this product should be taken with dinner, so it is not recommended to take it at lunch. Metformin hydrochloride extended-release tablets is a hypoglycemic drug, its main ingredient is metformin hydrochloride, this product can be used as monotherapy, for adults with type 2 diabetes mellitus who have ineffective glycemic control through diet and physical exercise alone, and can also be used in combination with sulfonylureas or insulin. It is a long-acting preparation and should be taken with dinner, and is not recommended to be taken at lunchtime to avoid poor blood glucose control at night. Common adverse reactions include nausea, vomiting, diarrhea, abdominal pain and loss of appetite, which can be relieved on their own. However, it should be contraindicated in patients who are allergic to the product or have a history of lactic acidosis and type 2 diabetes mellitus accompanied by ketoacidosis, hepatic and renal insufficiency, cardiac failure, serious infections, and traumas, and should be used in strict accordance with the doctor’s instructions.