Acarbose is a complex oligosaccharide that acts as an inhibitor of several enzymes responsible for the breakdown of complex carbohydrates in the intestines. It inhibits both pancreatic alpha-amylase and membrane-bound alpha-glucosidases - including intestinal glucoamylase, sucrase, maltase, and isomaltase - which are responsible for the metabolism of complex starches and oligo-, tri-, and disaccharides into absorbable simple sugars. By inhibiting the activity of these enzymes, acarbose limits the absorption of dietary carbohydrates and the subsequent postprandial increase in blood glucose and insulin levels.