How to Store Insulin

Insulin is measured in units. Most bottles, cartridges, and pens of insulin sold in the United States have 100 units of insulin per milliliter of fluid and are labeled U-100. Different strengths, like U-500, also are available in the U.S. Different strengths are used in other countries.

It's important to know the type of insulin you take and whether it should appear cloudy or clear. When you prepare to use a bottle, cartridge, or pen, check the insulin:

Storage Guidelines

Take steps to store your insulin correctly, or it might not work.

Expiration Guidelines

An open insulin bottle, cartridge, or pen is only good for a limited time. Follow these guidelines for discarding insulin:

Travel Tips

Follow these guidelines when you're traveling:


Clinical review by Dan Kent, pharmacist & certified diabetes educator
Group Health
Reviewed 03/01/2014