Back to Ask the Diabetes Team Ask the Diabetes Team

From Rockford, Illinois, USA:

My eight year old son was diagnosed with type 1 diabetes two months ago His insulins (N and Humalog) were both opened then and have been stored in the refrigerator, except to transport to another destination. His bedtime blood glucose readings have been quite high for the past five days or so. He has been anywhere from 220-384 mg/dl [12.2-21.3 mmol/L], normally he would be in 100-150 mg/dl [5.6-8.3 mmol/L] range. I know that some of the highs are related to holiday activities and were expected! The problem seems to be related to his dinner Humalog dosing. I have made small adjustments using the theory that he now requires more insulin. This has not solved the problem.

Could it be that we need a fresh vial of Humalog? Is two and one-half months a normal shelf life of Humalog? Both our endocrinologist and CDE have stated to expect at least three months. I know that Lilly states one month. Just curious as to your experience.


My experience has been that opened vials of insulin, the NPH and the Humalog should be replaced monthly. The unopened bottles that have been refrigerated should be okay until their expiration date. Regardless of how insulin has been stored and how long it has been open, I always instruct people to try using new vials when increases that should be working don't seem to be effective. It never hurts to rule out the possibility that there may a problem with the insulin.


Original posting 4 Jan 2001
Posted to Insulin Analogs


  Home Return to Top

Last Updated: Tuesday April 06, 2010 15:09:18
This Internet site provides information of a general nature and is designed for educational purposes only. If you have any concerns about your own health or the health of your child, you should always consult with a physician or other health care professional.

This site is published by T-1 Today, Inc. (d/b/a Children with Diabetes), a 501c3 not-for-profit organization, which is responsible for its contents.
By using this site, you agree to our Terms of Use, Legal Notice, and Privacy Policy.
© Children with Diabetes, Inc. 1995-2015. Comments and Feedback.