Single-dose vials have a BUD of 1 hour when prepared in ISO Class 5 or better; 24 hours when ISO Class 5 or worse.

Single-dose vials have a BUD of 1 hour when prepared in ISO Class 5 or better; 24 hours when ISO Class 5 or worse.

• A. 24 hours in ISO Class 5 or better; 1 hour in ISO Class 5 or worse
• B. 1 hour in ISO Class 5 or better; 24 hours in ISO Class 5 or worse
• C. 7 days; 14 days
• D. 48 hours; 96 hours

Answer: (B)

The key idea is how long a sterile product remains usable after it has been opened, based on how clean the compounding environment was. For single-dose vials, if the preparation (and puncture) occurs in an ISO Class 5 or better environment, the sterility risk is very low, so you should use the vial within 1 hour to minimize any chance of contamination. If the preparation happens in an environment that is ISO Class 5 or worse, the contamination risk is higher, and the allowed window before the product must be discarded is extended to 24 hours, recognizing a more limited but still practical use period. The other longer time frames are not appropriate for this scenario with single-dose vials opened under these conditions.

The key idea is how long a sterile product remains usable after it has been opened, based on how clean the compounding environment was. For single-dose vials, if the preparation (and puncture) occurs in an ISO Class 5 or better environment, the sterility risk is very low, so you should use the vial within 1 hour to minimize any chance of contamination. If the preparation happens in an environment that is ISO Class 5 or worse, the contamination risk is higher, and the allowed window before the product must be discarded is extended to 24 hours, recognizing a more limited but still practical use period. The other longer time frames are not appropriate for this scenario with single-dose vials opened under these conditions.