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A: If your room temperature goes above about 80 degrees Fahrenheit, you would be safer to keep your insulin in the refrigerator. Q: I use an insulin pen. I have heard I should keep my pen at room temperature for only two weeks. But insulin in vials can be kept at room temperature up to 28 days.
The package insert that comes with your insulin specifies how long it remains good once it is opened, or you can ask your local pharmacist. If the insulin is unopened, it must be kept refrigerated and is good until the expiration date on the vial or pen. The problem with using opened insulin beyond the guidelines listed on the package is that the insulin can lose its potency and not work as well to lower blood glucose levels.