How Long Does Insulin Last Once It's Been Opened?
A fellow caregiver asked... My mother has type 2 diabetes and needs help with her insulin injections. After I open a new bottle, how long does insulin last for, how should I store it, and how do I know whether it's gone bad? Expert Answers As a general rule, most bottles of insulin are good for 28 days once they're opened. Of course, how quickly a person goes through a vial is highly individual. Some may go through a bottle in a week or two. Others, on a lower dosage, may not use all the insulin within four weeks. But the drug's stability and potency is only guaranteed for 28 days. Opened insulin pens typically last 14 days, though some last only 10 days. If you're uncertain, check with your mother's pharmacist to find out how long her insulin should last. When either of you opens a new vial or pen, make a note on the calendar -- and note the date when you'll need to throw out any remaining insulin. It's best to store an opened bottle of insulin at room temperature, even though manufacturers often recommend refrigeration for opened containers. It's usually less painful to inject insulin when it's at room temperature than when it's cold. Store unopened insulin vials and pen cartridg Continue reading >>