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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.
Store Insulin for Future Use in the Refrigerator. Insulin intended for future use should be kept in a refrigerator at a temperature between 36 to 46 F (2.2 - 7.8C). This includes any unused, prefilled pens and insulin cartridges. But you do not want to store it any colder or the insulin will freeze and become unusable.