Back to Ask the Diabetes Team Ask the Diabetes Team

From Sinaloa, Mexico:

It seems to me very important to have insulins in a very good state because there can be high blood sugars thinking that you need to eat less or suspecting an occult infection. Which insulin ruins more easily out of the refrigerator (NPH, Lente, or Humalog)?


I believe that all insulins have similar instructions:

Unopened insulin should be stored in the refrigerator until the expiration date on the box. Insulin that is currently being used can be stored in the refrigerator or at room temperature for about a month. Some manufacturers advise that the insulin in their insulin pen cartridges (specifically Novolin NPH Penfill and Humulin NPH disposable pens) are only good for 14 days after opening.

Insulin tends not to perform well after repeated episodes of warming and cooling and warming and cooling. That is why many clinicians advise to keep opened vials/cartridges of insulin at room temperature.


Original posting 9 May 2002
Posted to Insulin


  Back to Ask the Diabetes Team Return to the Top of This Page

Last Updated: Tuesday April 06, 2010 15:09:34
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. Our mission is to provide education and support to families living with type 1 diabetes.
By using this site, you agree to our Terms of Use, Legal Notice, and Privacy Policy.
© Children with Diabetes, Inc. 1995-2018. Comments and Feedback.