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Bailey Rubin, Technical Sales Representative

Why Storage Conditions Matter

Concerns about the quality of compounded preparations do not end when they leave the cleanroom. From the time a preparation is compounded until it reaches the patient, it is exposed to environmental conditions that can directly impact its quality, stability, and assigned beyond-use date (BUD). Proper storage is a critical component of a pharmacy’s quality system. Maintaining appropriate storage conditions helps ensure compounded preparations remain safe, effective, and within specification throughout their assigned beyond-use date (BUD).

Regulatory Expectations for Finished Compounded Preparations

Regulatory guidance emphasizes the importance of maintaining appropriate storage conditions throughout a compounded preparation’s lifecycle. USP General Chapter 1079, Risk and Mitigation Strategies for the Storage and Transportation of Finished Drug Products, states that storage areas should consistently maintain the temperature ranges specified on the preparation’s labeling to preserve quality, efficacy, and beyond-use dating. These conditions should be established based on stability data and followed unless scientifically justified alternatives are supported. Stability testing evaluates how compounded preparations perform under defined environmental conditions and provides the scientific basis for establishing appropriate storage conditions and beyond-use dates.

USP recognizes that maintaining appropriate storage conditions involves more than simply setting a thermostat. Storage conditions can be affected by HVAC performance, airflow, facility traffic, seasonal variations, and other environmental factors. For these reasons, storage areas should be qualified through temperature mapping and supported by appropriate backup systems.

USP General Chapter 659, Packaging and Storage Requirements, outlines that storage conditions specified in a USP monograph should be followed unless the product labeling or prescribing information provides alternative storage instructions supported by stability data. When neither a USP monograph nor the product labeling specifies storage requirements, general protective measures should be implemented to minimize product degradation. Under these circumstances, preparations should be protected from temperatures above 40° C, moisture, freezing, and, when appropriate, light by using light-resistant containers during storage and transportation.

USP General Chapters 795 and 797 incorporate storage into the pharmacy’s overall quality management system by requiring compounded preparations to be stored under conditions that maintain their identity, strength, quality, and purity throughout the assigned beyond-use date (BUD), as supported by stability data. These chapters emphasize that storage conditions are an extension of the compounding process and require appropriate labeling, temperature control, documentation, and procedures for evaluating temperature excursions.

In addition, 21 CFR Part 205.50 requires facilities storing prescription drugs to provide appropriate environmental controls, including adequate lighting, ventilation, temperature and humidity control, sanitation, security, pest control, and designated quarantine areas. These general storage recommendations help protect product quality when more specific storage instructions are unavailable.

Key Storage Requirements for Finished Compounded Preparations

In summary, finished compounded preparations:

• Shall be stored according to the current edition of the compendium (USP/NF), stability data, and/or storage conditions specified on the preparation’s labeling.
• Should be maintained in qualified storage areas capable of consistently maintaining required temperature ranges using calibrated monitoring devices and documented procedures.
• Must be protected from temperatures above 40 °C, moisture, freezing, and, when appropriate, light throughout storage and transportation.
• May be evaluated following any temperature excursion to determine whether quality, stability, or the assigned beyond-use date may have been affected before dispensing or use.
• Should not be stored outside qualified storage conditions because of space limitations, equipment availability, or workflow convenience.

How Temperature Affects Stability

Temperature is one of the most significant contributors to chemical and physical instability in compounded preparations. Elevated temperatures can accelerate degradation reactions, reduce potency, and shorten the usable life of the preparation. Increased temperatures may also create additional challenges for moisture-sensitive formulations due to higher humidity. Conversely, freezing preparations not intended to be frozen may result in crystallization, precipitation, or other physical changes.

Monitoring Storage Conditions

Proper storage requires ongoing temperature monitoring. USP 1079 recommends calibrated devices capable of monitoring refrigerators, freezers, and controlled room temperature areas. Alarm systems should notify personnel when temperatures fall outside acceptable ranges so corrective action can be taken promptly.

If automated monitoring is unavailable, manual temperature logs may be used as part of a documented, risk-based monitoring program. Regardless of the monitoring method, temperature records should be reviewed routinely and retained as part of the pharmacy’s quality documentation.

Temperature excursions should be documented and evaluated using available stability data, excursion duration, temperatures reached, freeze-thaw history, and thermal cycling information when applicable. Decisions regarding compounded preparation disposition should always be supported by scientific evidence.

Supporting Stability and Quality Decisions

USP and other regulatory standards establish the framework for appropriate storage practices, while stability studies provide the scientific evidence needed to support storage recommendations and beyond-use dating. At ARL, we partner with 503A compounding pharmacies and 503B outsourcing facilities to generate stability and quality data, evaluate temperature-related concerns, and support confident storage decisions.

Contact ARL at info@arlok.com or call 1-800-393-1595 for more information to obtain the scientific data needed to support confident, compliant storage decisions.