What is the beyond-use date (BUD) for a multi-dose vial such as insulin after opening?

What is the beyond-use date (BUD) for a multi-dose vial such as insulin after opening?

• A. 7 days
• B. 14 days
• C. 28 days
• D. 56 days

Answer: (C)

Opening a multi-dose vial introduces the risk of contamination each time the stopper is punctured, so the used window after the first puncture is set to a conservative period. For insulin and similar parenteral meds kept refrigerated, the standard beyond-use date is 28 days. This timeframe balances preserving potency with minimizing contamination risk. Store the vial at 2-8°C, protect from light, and discard after 28 days or sooner if you notice any signs of contamination or changes in appearance. Longer or shorter windows are not typical unless specific manufacturer guidance or local policy says otherwise. The 28-day period reflects the common practice for opened insulin multi-dose vials.

Opening a multi-dose vial introduces the risk of contamination each time the stopper is punctured, so the used window after the first puncture is set to a conservative period. For insulin and similar parenteral meds kept refrigerated, the standard beyond-use date is 28 days. This timeframe balances preserving potency with minimizing contamination risk. Store the vial at 2-8°C, protect from light, and discard after 28 days or sooner if you notice any signs of contamination or changes in appearance. Longer or shorter windows are not typical unless specific manufacturer guidance or local policy says otherwise. The 28-day period reflects the common practice for opened insulin multi-dose vials.