Insulin is a hormone that is produced in the body. It works by lowering levels of glucose
(sugar) in the blood. Insulin lispro is a fast-acting form of insulin. Insulin lispro protamine is an
intermediate-acting form of insulin.
Insulin lispro and insulin lispro protamine is used to treat type 1 (insulin-dependent) diabetes in
adults. It is usually given together with another long-acting insulin.
Insulin lispro and insulin lispro protamine may also be used for other purposes not listed in this
medication guide.