Antidiabetic drugs are medicines that help control blood sugar levels in people with diabetes mellitus (sugar diabetes). Diabetes mellitus is a disorder of metabolism, the processes through which the body uses food that has been broken down by digestion. Most food is broken down into a type of sugar called glucose, which the body can use for energy and growth. Glucose travels through the bloodstream to cells throughout the body. But glucose cannot enter the cells without the help of a hormone called insulin. Insulin is produced by the pancreas, a large gland beneath the stomach. In people with diabetes mellitus, the body does not have enough insulin to move the glucose into the cells. This may be because the pancreas does not produce enough insulin or because the cells do not respond to the insulin, even though plenty is produced. Either way, glucose builds up...