This combination medication is used along with a proper diet and exercise program to control high blood sugar in people with type 2 diabetes. Controlling high blood sugar helps prevent kidney damage, blindness, nerve problems, loss of limbs, and sexual function problems. Proper control of diabetes may also lessen your risk of a heart attack or stroke.Pioglitazone belongs to a class of drugs known as thiazolidinediones or "glitazones". Metformin and pioglitazone work by helping to restore your body's proper response to the insulin you naturally produce. Metformin also decreases the amount of sugar that your liver makes and that your stomach/intestines absorb.Talk to your doctor about the risks and benefits of using pioglitazone-containing products.Taken as directed by physician.