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Safeguarding the "Temperature Defense Line" for Drug Safety: A Comprehensive Analysis of GSP Construction Standards and Technical Requirements for Pharmaceutical Cool Storage

2026-05-08

Drug safety is a matter of life and health, and cool storage facilities serve as critical infrastructure within the drug storage system. The quality of their construction directly determines the efficacy and safety of pharmaceuticals during distribution. According to the explicit provisions of the Good Supply Practice for Pharmaceutical Products (GSP) and the Chinese Pharmacopoeia, the construction of pharmaceutical cool storage is far from a simple "cooling project." It is a systematic engineering endeavor involving precise temperature control, humidity management, architectural structure, monitoring systems, and validation protocols. This article provides a comprehensive analysis of GSP construction standards and technical requirements for pharmaceutical cool storage from four dimensions: regulatory standards, core technologies, construction essentials, and management protocols.

 

 

Regulatory Foundation: GSP's Core Definition of Cool Storage

According to the explicit provisions of the Good Supply Practice for Pharmaceutical Products (GSP) and the Chinese Pharmacopoeia 2020 Edition, the temperature in pharmaceutical cool storage must be strictly controlled at ≤20℃, with regional temperature differences not exceeding 2℃. In practical engineering applications, the operating temperature of cool storage is typically set between 10℃ and 20℃, a range that effectively reduces the risk of drug deterioration while ensuring storage environment stability.

Meanwhile, GSP establishes uniform requirements for relative humidity across all types of pharmaceutical warehouses: 45%–75%. This humidity range aims to prevent drugs from becoming damp and moldy or experiencing degradation of active ingredients due to excessive dryness. Notably, some authoritative sources suggest maintaining relative humidity in cool storage at approximately 60% to simulate the most suitable environment for drug preservation.

Furthermore, GSP classifies pharmaceutical warehouses into three types based on storage conditions: ambient temperature storage (0–30℃), cool storage (≤20℃), and cold storage (2–10℃). Enterprises must classify and store drugs in the corresponding warehouses according to the storage conditions specified on drug labels.

 

Architecture and Structure: The "Skeleton Engineering" of Cool Storage

1. Site Selection and Environmental Requirements

GSP imposes strict requirements on the site selection for pharmaceutical cool storage: warehouses should be built away from residential areas, on flat and solid ground with higher elevation to ensure rapid drainage during rainy seasons; they should also be far from serious pollution sources, garages, and oil depots to ensure a dry and well-ventilated environment. Ground surfaces within the warehouse area should be fully hardened or landscaped, avoiding planting of insect-attracting or pollen-producing vegetation, with drainage systems kept unobstructed and ground surfaces free of standing water.

2. Building Structure and Insulation Materials

The main building structure should utilize materials conducive to thermal insulation and temperature preservation. In engineering practice, cool storage walls typically employ polyurethane double-sided color steel sandwich panels, with thicknesses ranging from 100mm to 120mm depending on warehouse scale and insulation requirements, and fire ratings meeting Class B1 standards. These materials offer excellent moisture-proof and thermal insulation properties, effectively reducing heat exchange and lowering long-term operational costs.

Interior finishes should use non-toxic, non-polluting materials with minimal dust generation, low moisture absorption, and resistance to dust particle adhesion. Doors and windows should be designed simply and airtight to ensure environmental sealing between interior and exterior; connections between walls, floors, and ceilings should feature curved transitions for ease of cleaning. Warehouses should minimize window quantity and size, and loading/unloading areas must have canopies to protect drugs from sun exposure, rain, snow, and dust during handling.

3. Functional Zoning Within the Warehouse Area

According to GSP requirements, the interior of cool storage must be divided into distinct zones based on drug quality management status: quarantine area, qualified products area, dispatch area, non-conforming products area, and returned goods area. Each zone must feature clear and prominent color-coded signage in compliance with pharmaceutical warehousing color-code management requirements. Additionally, the warehouse area should be divided into drug storage operation zones, auxiliary operation zones, and office/living zones, with appropriate distances or effective separation measures between functional zones to ensure that personnel and material flows do not interfere with storage operations.

 

 
 
 
 
 
 

Refrigeration and Temperature Control: The "Heart System" of Cool Storage

1. Refrigeration System Configuration

The refrigeration system of pharmaceutical cool storage must possess extremely high stability and reliability. According to the explicit requirements of GSP Article 49, enterprises dealing with refrigerated and frozen drugs must be equipped with standby generator sets or dual-circuit power supply systems to prevent temperature loss of control due to unexpected power outages. In practical engineering, large-scale cool storage typically adopts "one active, one standby" or "N+1" redundant refrigeration systems—where one host unit operates while one standby unit remains ready, automatically switching over when the host fails to ensure an unbroken temperature chain.

Regarding equipment selection, external cooling sources typically employ professional energy-saving screw chiller systems, with terminal units configured as high-speed, high-airflow cabinet units or jet fans, or through the addition of extended fabric air ducts and other facilities. Equipment is rationally arranged according to shelving layout to ensure temperature uniformity across the entire warehouse area falls within reasonable differential ranges.

2. Temperature Uniformity Control

Temperature uniformity is one of the core technical indicators in pharmaceutical cool storage construction. GSP requires that temperature differences between regions within the warehouse do not exceed 2℃, meaning that air distribution must be fully considered during the design phase. Through rational arrangement of air coolers and return air paths, optimization of shelving layout, and prevention of goods blocking air outlets, local "hot spots" or "cold spots" can be effectively eliminated, ensuring that temperatures at any location within the warehouse comply with regulatory requirements.

3. Temperature and Humidity Monitoring and Alarming

GSP mandates that cool storage must be equipped with 24/7 continuous automatic temperature and humidity monitoring systems. Each storage compartment must have at least one temperature and humidity detector, with generally at least one detector per 300 square meters of storage area. Detectors should be mounted at eye level for recording personnel to accurately reflect average warehouse temperature conditions.

The monitoring system must possess the following functions:
Real-time display and recording: Continuous collection of temperature and humidity data with recording intervals not exceeding 30 minutes;
Automatic alarm function: When temperature or humidity exceeds set ranges, the system must promptly notify management personnel through SMS, audible/visual alarms, telephone, and other means;
Data retention and traceability: Temperature and humidity records must be preserved for no less than 5 years to ensure full-process traceability;

Regular sensor calibration: Temperature and humidity recorders require periodic calibration to ensure data accuracy.

 


Supporting Facilities: The "Safety Net" of Cool Storage

1. Shelving and Pallets

The distance between drugs and the ground must be maintained at more than 10cm. Pallets and shelving materials may include metal, wood, or composite materials with sufficient structural strength, and must not produce direct or potential impacts on drug quality. Shelving layouts should ensure reasonable spacing to facilitate air circulation and improve overall temperature control effectiveness.

2. Light Protection and Ventilation

Warehouses storing packaged drugs must implement measures to prevent direct sunlight exposure. Storage areas designated as sealed and light-protected for unpackaged drugs must employ effective natural light avoidance measures. Warehouses should be equipped with necessary ventilation equipment, with protective screens on windows and protective louvers on exhaust fans. Ventilation must never be achieved by opening doors, and ventilation openings must never be installed in warehouse walls.

3. Safety Protection

Cool storage must implement comprehensive safety protection measures, including:
Pest and rodent control: Electronic rodent repellents, baffles, sticky traps, and snap traps, as well as screens, door curtains, and fly lights;
Dust, moisture, and mold prevention: Equipped with vacuum cleaners, dehumidifiers, and other equipment;
Fire safety: Provision of fire protection and safety facilities meeting regulatory requirements;

Lighting safety: Lighting equipment must meet electrical safety requirements, with wiring in conduits and no exposed cables, and fixtures equipped with protective covers.

4. Special Drug Management

For special control drugs including narcotics, psychotropic substances, toxic drugs, and radioactive materials, dedicated warehouses must employ windowless brick-concrete or steel-concrete structures with solid infrastructure and impact resistance, equipped with steel security doors, fire protection, and alarm systems. Dual-person, dual-lock management must be implemented, with alarm systems connected to emergency services (110).

 

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