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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.
Insulin pens or vials are considered âopenâ once the rubber stopper is punctured, and most brands are good for up to 28 days at room temperature or in the refrigerator. Refrigerating the open pen or vial does not make the pen stay âfresherâ; it lasts the same amount of time whether the insulin is kept at room temperature or refrigerated.