Like oral diabetes medications, insulin is an alternative for some people with noninsulin-dependent diabetes who can't control their blood glucose levels with diet and exercise. In special situations, such as surgery and pregnancy, insulin is a temporary but important means of controlling blood glucose. Points to Remember Insulin may be used when diet, exercise, or oral medications don't control diabetes. Weight control is important when taking insulin. Insulin is taken in special situations such as surgery and pregnancy.
Experts do know that weight control is essential for insulin to be effective.
A doctor is likely to prescribe insulin if diet, exercise, or oral medications don't work, or if someone has a bad reaction to oral medicines. A person also may have to take insulin if his or her blood glucose fluctuates a great deal and is difficult to control. A doctor will instruct a person with diabetes on how to purchase, mix, and inject insulin. Various types of insulin are available that differ in purity, concentration, and how quickly they work. They also are made differently.