Beyond-Use Dating vs Expiration Dates: PTCB Guide

Two Different Dating Systems

Pharmacy technicians must understand the difference between expiration dates and beyond-use dates (BUDs). These two concepts serve different purposes and are governed by different standards. Confusing them is a common PTCB exam mistake that this guide will help you avoid.

Expiration Dates

An expiration date is assigned by the drug manufacturer based on stability testing. Key facts:

• Determined through rigorous stability studies per FDA requirements
• Applies to the original, unopened manufacturer packaging
• Expressed as month/year; the medication is good through the last day of that month
• Guarantees the drug meets all specifications for potency, purity, and quality until that date when stored properly
• Printed on every medication container

Once a manufacturer's container is opened, the expiration date may no longer apply, and a beyond-use date may need to be assigned.

Beyond-Use Dates

A beyond-use date (BUD) is assigned by the pharmacy and represents the date after which a compounded or repackaged preparation should not be used. BUDs are governed by USP standards:

Non-Sterile Compounding (USP 795)

• If a source for a specific BUD exists (published stability data), use that data
• If no stability data exists, follow USP 795 default BUDs based on the dosage form and storage conditions
• General defaults: aqueous preparations get shorter BUDs than solid preparations due to microbial contamination risk

Sterile Compounding (USP 797)

BUDs for sterile preparations depend on the risk category and storage conditions:

• Category 1 CSPs: BUDs are limited based on whether stored at room temperature, refrigerated, or frozen
• Category 2 CSPs: Extended BUDs allowed with additional quality controls including sterility testing
• The key principle: the more controlled the compounding environment and the more testing performed, the longer the BUD

Repackaged Medications

When pharmacy technicians repackage medications from manufacturer bulk bottles into unit-dose packaging:

• The BUD is typically the earlier of: one year from repackaging or the manufacturer's expiration date
• Some products may have shorter repackaging BUDs based on stability characteristics

Key Differences for the PTCB Exam

• Source: Expiration dates come from manufacturers; BUDs come from the pharmacy
• Standards: Expiration dates are FDA-regulated; BUDs follow USP standards
• Application: Expiration dates apply to original packaging; BUDs apply to compounded or repackaged products
• Duration: Expiration dates are typically years; BUDs may be hours to months depending on the preparation

Storage Conditions and Dating

Both expiration dates and BUDs assume proper storage conditions. If a medication has been exposed to temperatures, light, or humidity outside its labeled storage conditions, it may no longer be safe to use regardless of the date. Pharmacy technicians must monitor storage conditions and document any excursions.

PTCB Exam Preparation

The PTCB exam tests your understanding of both dating systems, particularly USP 797 BUDs for sterile compounding. Know the default BUDs for each risk category and understand when manufacturer expiration dates versus pharmacy-assigned BUDs apply. Study at PTCBprep and practice at our mini exams.