Can Dog Insulin Go Bad? It’s important to note that insulin can go bad before its expiration date. This happens very rarely, but if you feel that your insulin isn’t working as well as it should, try switching to a new vial or pen. How long can you leave dog insulin out of the fridge?
Does Insulin Need To Be Refrigerated? Does insulin need to be refrigerated? Does insulin need to be refrigerated? The short answer: Yes. Most manufacturers recommend refrigerating unopened insulin. What happens if you don’t refrigerate insulin? Note: Insulin loses some effectiveness when exposed to extreme temperatures. The longer the exposure to extreme temperatures, the less effective