Once the rubber stopper on an insulin vial has been punctured, how long is the vial good for?

After the rubber stopper on an insulin vial has been punctured, the vial maintains its integrity and remains usable for a limited period due to the risk of contamination and degradation. The correct duration for which a punctured insulin vial can be used is 28 days. This timeframe ensures that the insulin remains effective and that the risk of microbial growth is minimized, aligning with best practices in medication storage and handling.

This designation of 28 days reflects the stability and efficacy of the insulin, as well as adherence to health regulations and guidelines. Following this time period, the insulin should be discarded even if there appears to be remaining product, to ensure patient safety and medication effectiveness.