<qa>  What is Metformin?Metformin is an oral antihyperglycemic, insulin-sensitizing agent that has been used in many countries for treatment of type 2 diabetes for more than 40 years. In March 1995, it was approved by the Food and Drug Administration for the treatment of adult type 2 diabetes. Metformin improves insulin sensitivity and reduces insulin resistance by hepatic and peripheral actions. It does not increase insulin secretion. 