What is the shelf life of an opened insulin glargine vial?

How long can you keep an opened insulin glargine vial?

For most insulin glargine products, once a vial is opened you generally keep it in use for about 28 days. After that, discard the vial even if insulin remains.

What storage conditions change the shelf life?

The “opened vial” life assumes you follow the product’s storage rules, typically:
- In use after opening: store at room temperature or refrigerated, depending on the specific product labeling.
- Avoid freezing and keep away from heat and direct light.

If your vial’s label or insert specifies a different opened-vial duration (some brands/products differ), follow the exact instructions for your specific insulin glargine.

How do you know if it has gone bad?

Do not use the insulin if it:
- looks cloudy or has particles (insulin glargine is usually clear)
- has been frozen
- has exceeded the labeled 28-day (or product-specific) opened-vial limit

What’s the difference between “opened shelf life” and “unopened expiration date”?

• Unopened: use the labeled expiration date on the box/vial.
  
• Opened: even if the unopened expiration date hasn’t arrived, you still discard after the opened-vial period (commonly 28 days) because potency can decline once exposed to repeated use.
  
  

If you tell me the brand, can you confirm the exact time?

Yes. If you share the brand name on the vial (for example, Lantus, Basaglar, or another glargine product) and whether it’s in pens or vial form, I can point you to the exact opened-vial duration from the product labeling.