Repaglinide is used alone or with other medications to control high blood sugar along with a proper diet and exercise program. It is used 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. It works by stimulating the body to produce more insulin. Insulin is a natural substance that allows the body to properly use sugar from the diet.