http://www.PreOp.com Diabetes Patient Education How you store your insulins before and after you open the vials or cartridges is most important. Unopened insulins are: * best kept in the refrigerator. * This provides a constant temperature * and they can be kept until the manufacturer’s expiration date shown on the vial or pen. Diabetes Patient Education * If unopened vials or pens are stored at room temperature, they can be kept for only more limited periods of time. * At all times, the manufacturer’s instructions should be studied and followed. Opened vials are: Diabetes Patient Education * best stored in the refrigerator to provide a constant temperature. * Whether refrigerated or not, opened vials are only good for 28 days. * Once opened, whether stored in the refrigerator or at room temperature, pens or cartridges in use are only good for the limited period of time * stated in the manufacturer’s instructions. Diabetes Patient Education