Metformin hypoglycemia. Metformin belongs to the biguanide class of hypoglycemic drugs, generally used for the treatment of type 2 diabetes mellitus patients who are not satisfied with dietary control and physical exercise alone. Taking metformin can reduce hepatic glucose synthesis and intestinal glucose absorption, which can help diabetic patients make full use of endogenous insulin and reduce fasting as well as postprandial hyperglycemia, so metformin lowers blood sugar. Adverse effects such as nausea, vomiting, hypoglycemia, headache, and fatigue may occur after taking this drug. You should consult your doctor before using Metformin and it is strictly prohibited for patients who are allergic to Metformin, have kidney disease, or severe infections. Patients using metformin must strictly follow the doctor’s instructions to use the drug, do not arbitrarily self-medication.