NCIt definition : Any antidiabetic agent with the biguanide base structure or phenformin derivatives
with antihyperglycemic activity. Biguanide antidiabetic agents activate AMP-activated
protein kinase (AMPK) resulting in decreased glucose production in the liver, increased
peripheral glucose uptake and improved utilization of glucose. Biguanide-based antidiabetic
agents do not cause hypoglycemia. In addition, biguanide antidiabetics decrease absorption
of glucose from the gastrointestinal tract.;