Introduction to Specialized Cold Storage for Pharmaceutical Storage

Biological products (such as insulin, vaccines, and monoclonal antibodies) have complex components, mostly proteins and peptides, which are extremely sensitive to temperature and prone to denaturation and invalidation due to temperature fluctuations. They are the most strictly required category in pharmaceutical cold storage, requiring constant low temperature throughout the process, while controlling the humidity in the warehouse to avoid mold and contamination. High-precision temperature and humidity control equipment must be configured in the warehouse to ensure stable environmental parameters.

•  Vaccines

Divided into inactivated vaccines and live attenuated vaccines, the optimal storage temperature is 2℃ to 8℃. This temperature range can effectively inhibit the degradation of vaccine components, ensure vaccine titer, and enable safe storage for 6-12 months (specifically in accordance with the vaccine instructions). It should be noted that the temperature fluctuation in the warehouse must be strictly controlled within ±0.5℃, and the humidity should be controlled at 45%-65%. Direct sunlight and severe vibration should be avoided. At the same time, special cold chain monitoring equipment must be equipped to realize full-process traceability of temperature data, complying with the national standards for vaccine storage and transportation management. Anti-ultraviolet facilities should be installed in the warehouse to eliminate the impact of light.

•  Insulin and Biologics

The conventional storage temperature is 2℃ to 8℃. For short-term (1-2 weeks) carrying, it can be placed in a cool environment below 25℃. For long-term storage, the constant temperature of 2℃ to 8℃ must be strictly maintained. Some special biologics (such as long-acting insulin and biological protein preparations) need to be stored in a low-temperature warehouse at -20℃ to -10℃, with a storage period of 12-24 months. A special low-temperature storage unit must be adopted, equipped with an anti-freeze-thaw control system to avoid component denaturation caused by repeated freezing and thawing.

The stability of chemical drugs (such as antibiotics, antihypertensive drugs, and anti-tumor drugs) varies greatly. Most of them need to be stored in a cool or refrigerated environment. For some volatile and decomposable drugs, low-temperature storage is required. Temperature control must balance efficacy retention and component stability to avoid drug decomposition and invalidation due to excessively high temperatures. Corresponding temperature and humidity control modules should be configured in the warehouse according to the characteristics of the drugs.

•  Conventional Chemical Preparations

Such as oral antibiotics, antihypertensive drugs, and cold medicines, the suitable storage temperature is 0℃ to 20℃ (cool warehouse standard), with a storage period of 12-24 months. The humidity in the warehouse is controlled at 45%-75% to avoid moisture absorption and caking of drugs due to humidity. Some easily oxidized and decomposable preparations (such as vitamins and nitrates) need to be stored in a refrigerated warehouse at 2℃ to 8℃ to reduce component oxidation and extend the shelf life.

•  APIs and Anti-tumor Drugs

Most API are in powder form, prone to moisture absorption and decomposition, with a suitable temperature of 2℃ to 8℃ and a humidity of 40%-60%, with a storage period of 18-24 months. Anti-tumor drugs (such as chemotherapy drugs) are mostly cytotoxic drugs, which need to be stored in a refrigerated warehouse at 2℃ to 8℃. Some need to be stored at -20℃ low temperature to avoid increased drug toxicity or reduced efficacy. They must be stored in separate partitions, equipped with special protective facilities and ventilation systems to prevent cross-contamination.

Proprietary Chinese medicines have components mostly extracted from plant and animal medicinal materials, which are prone to moisture absorption, mold, and insect infestation. The requirement for humidity control is higher than that for temperature. Temperature control is mainly cool and dry to avoid drug deterioration and efficacy loss due to high temperature and humidity. Efficient dehumidification equipment must be configured in the warehouse to regularly monitor humidity changes and make timely adjustments.

•  Proprietary Chinese Medicine Preparations

Such as tablets, capsules, and oral liquids, the suitable storage temperature is 0℃ to 20℃ (cool warehouse), with a humidity of 45%-65% and a storage period of 12-36 months. Direct sunlight and high-temperature and high-humidity environments should be avoided to prevent drug discoloration, adhesion, and invalidation. Some proprietary Chinese medicines containing volatile components (such as Huoxiang Zhengqi Water and peppermint preparations) need to be stored at 2℃ to 8℃ to reduce component volatilization.

•  Chinese Medicinal Decoction Pieces

The suitable storage temperature is 0℃ to 20℃, with a humidity of 40%-60% and a storage period of 6-18 months. Regular ventilation and dehumidification are required, equipped with insect-proof and mold-proof facilities to avoid mold and insect infestation. Some precious Chinese medicinal decoction pieces (such as ginseng, antler, and cordyceps sinensis) need to be stored in a refrigerated warehouse at 2℃ to 8℃, and independent sealed storage units can be set in the warehouse to ensure the quality of the medicinal materials.

Specially controlled drugs must strictly follow the relevant national management regulations. In addition to meeting temperature and humidity requirements, they must also have anti-theft, anti-loss, and traceability functions. The storage environment must be independent and airtight, with full-process monitoring.

•  Narcotics and Class I Psychotropic Drugs

The suitable storage temperature is 0℃ to 20℃, with a humidity of 45%-65%. They must be stored in a special safe or independent airtight warehouse. The warehouse is equipped with monitoring and alarm systems, and temperature and humidity data are recorded in real time. The storage period is implemented according to the drug shelf life, and the inbound and outbound registration system is strictly implemented.

•  Class II Psychotropic Drugs

The suitable storage temperature is 0℃ to 20℃, with a humidity of 45%-75%. They must be stored in separate partitions, equipped with anti-theft facilities, and temperature and humidity are monitored in real time to ensure that the drugs are not lost or deteriorated.

•  Cool Warehouse (0℃ to 20℃)

Suitable for conventional chemical preparations, proprietary Chinese medicines, and specially controlled drugs. The suitable thickness of the insulation panel is 100mm. This thickness can effectively block the penetration of external heat and humidity, maintain a constant temperature in the warehouse, balance energy efficiency and economy. If the region is hot in summer (outdoor maximum temperature ≥35℃) or has high humidity (annual average humidity ≥75%), it can be adjusted to 120mm to improve the thermal insulation and moisture-proof effect, reduce the operation load of refrigeration and dehumidification equipment, and meet the requirements of GSP cool warehouses. The panels need to be equipped with moisture-proof sealing treatment to prevent moisture penetration.

•  Refrigerated Warehouse (2℃ to 8℃)

Suitable for vaccines, insulin, some biologics, anti-tumor drugs, and precious Chinese medicinal decoction pieces. The suitable thickness of the insulation panel is 150mm. This thickness is the conventional standard thickness for pharmaceutical refrigerated warehouses, which can ensure that the temperature fluctuation in the warehouse does not exceed ±0.5℃, the humidity is stable within the specified range, effectively reducing energy consumption, balancing thermal insulation effect and construction cost, and meeting the GSP requirements for refrigerated pharmaceutical storage. The joints of the panels need to be sealed to reduce cold bridge loss.

•  Low-Temperature Warehouse (-20℃ to -10℃)

Suitable for special biologics, some API, and anti-tumor drugs. The suitable thickness of the insulation panel is 180mm. This type of cold storage has a low temperature, requiring thicker panels to block external heat penetration, avoid cold air loss, and reduce the operation load of refrigeration units, lowering operational energy consumption. The panels need to pass the -30℃ low-temperature shrinkage test with a deformation rate ≤0.5% to ensure stability in low-temperature environments. The warehouse needs to be equipped with low-temperature anti-freezing facilities to prevent refrigeration unit freezing damage.

•  Selection of outer panel material

Adjust according to the use scenario. 304 or 316L stainless steel plates (thickness 0.6-1.0mm) are preferred, which have excellent corrosion resistance, easy cleaning, and no odor, meeting the hygiene requirements for pharmaceutical storage. Ordinary cool warehouses can use color steel plates (thickness 0.4-0.6mm), which have both rust prevention and decorative functions. For coastal or high-humidity areas, embossed aluminum plates (thickness 0.5-0.8mm) can be selected, which have strong wind pressure resistance and corrosion resistance. The inner layer is uniformly made of polyurethane foam to ensure thermal insulation performance.

•  Regional adjustment principle

In cold northern regions (outdoor temperature below -20℃ in winter), the thickness of cold storage panels in the same temperature range can be increased by 20mm-30mm to improve the thermal insulation effect and reduce energy consumption. In hot and high-humidity southern regions, it can be slightly increased by 10mm-20mm, and equipped with high-efficiency dehumidification equipment to balance thermal insulation, moisture-proof and cost. For large-scale pharmaceutical cold storage (storage capacity ≥500㎡), due to the higher risk of cold air and moisture loss, it is recommended to increase the thickness by 20mm on the basis of the corresponding temperature-adapted thickness to ensure stable environment in the warehouse.

•  Insulation and compliance details

The cold storage door must be equipped with airtight strips, automatic door-closing devices, and observation windows, matching the thickness of the insulation panels to avoid cold air and moisture loss. Cold bridge parts must be treated with thermal break and equipped with cold bridge blockers to prevent condensation. The ground must be equipped with a ventilation elevated layer or electric tracing system to prevent foundation frost heave and facilitate cleaning and disinfection. A cleaning and disinfection channel must be reserved in the warehouse to facilitate daily operation and maintenance, strictly following GSP specifications.