Insulin products typically have short expiration dating once the container is opened. If your insulin is in a vial, it is stable for 28 days once it is opened regardless of whether it is refrigerated or not. If your insulin is in a pen form, it is stable for 10 to 28 days(depending on insulin type)unrefrigerated, and up until the manufacturer´s expiration date on the box if it is refrigerated regardless if it is opened or not.

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