Novolin 30R is a class of insulin, a premixed insulin, which is a preparation consisting of diphasic insulin. This contains 30% soluble neutral insulin and 70% low arginine zinc insulin, which is a mixed type of insulin, and these two insulins differ mainly in the time of action. The main action of insulin is to lower blood sugar, which is able to bind to insulin receptors on muscle and fat cells to promote glucose absorption, and to inhibit the release of glucose from the liver. The drug is a mixed type of insulin, including fast-acting and slow-acting, as well as short-acting and long-acting insulins, so the main effect of the drug is to lower blood sugar.