What is the maximum effective duration of regular insulin (Humulin R)?

The maximum effective duration of regular insulin (Humulin R) is typically up to 42 days. This duration refers to the period during which the insulin remains stable and effective for use after being opened and stored properly. Regular insulin is a short-acting insulin that starts working within 30 minutes and usually lasts for about 4 to 6 hours, but the 42-days timeframe accounts for its stability in the vial or pen.

In terms of practical application, understanding this duration is crucial for managing diabetes effectively, as it influences how long a patient can use a vial or pen before needing a replacement. It’s important to always refer to the specific product guidelines and recommendations for storage and use.