Usage: Insulin glargine products are used to treat type 1 diabetes (condition in which the body does not produce insulin and therefore cannot control the amount of sugar in the blood). Insulin glargine products are also used to treat people with type 2 diabetes (condition in which the body does not use insulin normally and, therefore, cannot control the amount of sugar in the blood) who need insulin to control their diabetes. In people with type 1 diabetes, insulin glargine products must be used with another type of insulin (a short-acting insulin). In people with type 2 diabetes, insulin glargine products also may be used with another type of insulin or with oral medication(s) for diabetes. Insulin glargine is a long-acting, manmade version of human insulin. Insulin glargine products work by replacing the insulin that is normally produced by the body and by helping move sugar from the blood into other body tissues where it is used for energy. It also stops the liver from producing more sugar.