Opened insulin lasts for how long?

Opened insulin lasts for how long?

• A. One week
• B. Six months
• C. One month
• D. One year

Answer: (C)

Opened insulin loses potency over time because exposure to air, temperature changes, and potential contamination can degrade it. To ensure accurate dosing and safety, discard an opened vial after about 28 days (roughly one month). This guideline prevents reduced effect or contamination from affecting your insulin needs. Unopened insulin remains stable until its printed expiration date, but once a vial is opened, it should not be kept longer than about a month. The other timeframes (a week or several months) are not appropriate because potency and sterility can't be guaranteed beyond a short, defined period.

Opened insulin loses potency over time because exposure to air, temperature changes, and potential contamination can degrade it. To ensure accurate dosing and safety, discard an opened vial after about 28 days (roughly one month). This guideline prevents reduced effect or contamination from affecting your insulin needs. Unopened insulin remains stable until its printed expiration date, but once a vial is opened, it should not be kept longer than about a month. The other timeframes (a week or several months) are not appropriate because potency and sterility can't be guaranteed beyond a short, defined period.