Like "I found this on a site and might help. Metformin ( Glucophage®) is a prescription diabetes medication. It is used for controlling blood sugar in people with type 2 diabetes. Many people may wonder, "How does it work?" Metformin belongs to a class of drugs known as biguanide medications and works in several ways. The medicine reduces the amount of sugar made by the liver, limits the amount of sugar absorbed into the body from the diet, and makes insulin receptors more sensitive (helping the body respond better to its own insulin). All of these effects cause a decrease in blood sugar levels.Since metformin does not increase the amount of insulin produced by the body, it is less likely to cause dangerously low blood sugar (hypoglycemia), as many other diabetes medications can do. At http://diabetes.emedtv.com/metformin/how-does-metformin-work.html"