7 Common Mistakes in Storing Pharmaceutical Raw Materials and How to Ensure Their Stability
Improper storage of pharmaceutical raw materials can lead to loss of efficacy, contamination, or even safety risks. Which mistakes should be avoided, and how can optimal conditions for APIs, excipients, and intermediates be ensured?
Photo: TECNIC Bioprocess Solutions / Unsplash
Pharmaceutical raw materials, whether active pharmaceutical ingredients (APIs), excipients, or intermediates, require careful handling and specific storage conditions. Even minor deviations from recommended parameters can cause degradation, loss of efficacy, or contamination, which jeopardizes the quality of the final drug. Many of these issues arise unnecessarily—due to insufficient temperature, humidity, or light control, or improper organization of storage spaces. In this article, we will look at seven of the most common mistakes repeated in the pharmaceutical industry and advise on how to avoid them.
1. Ignoring temperature requirements and monitoring
Pharmaceutical raw materials are often sensitive to temperature fluctuations, which can accelerate degradation, alter physical properties, or reduce efficacy. Common mistakes include storage at room temperature without regard to manufacturer specifications, insufficient insulation of storage areas, or missing temperature condition records. For example, some active ingredients require storage at temperatures below 8 °C, while others may degrade at temperatures above 25 °C. Prolonged exposure to unsuitable temperatures can lead to impurity formation, loss of solubility, or even complete loss of functionality.
The solution is to implement a continuous temperature monitoring system with alarms for exceeding set limits. Ideally, data loggers with automatic recording and remote access capability should be used. Storage areas should be equipped with air conditioning or cooling units with a redundant system in case of failure. It is also important to regularly calibrate measuring equipment and train staff in procedures for handling deviations. For extremely sensitive raw materials, validated cooling boxes with temperature mapping can be used.
2. Insufficient Protection Against Moisture and Light
Moisture and light are among the most common factors causing degradation of pharmaceutical raw materials. Hygroscopic substances, such as certain salts or sugars, can absorb moisture from the air, leading to deterioration of flow properties, clumping, or chemical reactions. For example, ascorbic acid rapidly oxidizes at high humidity, while some antibiotics lose efficacy. Similarly, light, especially UV radiation, can catalyze photochemical reactions that alter molecular structure and reduce stability.
To minimize these risks, it is crucial to store raw materials in their original packaging with a protective barrier against moisture and light. If repackaging is necessary, materials with low water vapor permeability (e.g., aluminum foils or multi-layer bags with desiccants) should be used. Storage areas should have controlled relative humidity, ideally between 30–50%, and be equipped with UV filters on windows or artificial lighting without UV components. For sensitive substances, the use of desiccants in sealed containers and regular humidity checks using hygrometers are recommended.
Photo: TECNIC Bioprocess Solutions / Unsplash
3. Improper Handling and Cross-Contamination
Cross-contamination is a serious risk in the pharmaceutical industry that can lead to drug inefficacy, allergic reactions, or even toxic effects. Common mistakes include using the same tools for handling different raw materials, inadequate cleaning of work surfaces, or storing open containers without proper sealing. For example, residues of strongly aromatic substances can contaminate sensitive raw materials such as hormones or vaccines, altering their properties. Similarly, dust from powdered substances can cause issues in the production of sterile products.
Prevention involves implementing strict handling procedures, including separate work zones for different categories of raw materials (e.g., highly potent substances, allergens, cytotoxic substances). Tools and equipment should be cleaned and validated between uses, ideally with suitable detergents and disinfectants. Raw materials should be stored in sealed, labeled containers with a clear identification system. It is also important to adhere to Good Manufacturing Practice (GMP) principles and provide regular staff training on contamination prevention.
4. Improper Inventory and Packaging Material Management
Improper inventory management can lead to exceeding expiration dates, unnecessary waste, or the use of degraded raw materials. Typical mistakes include failing to follow the FIFO (First In, First Out) principle, insufficient monitoring of expiration dates upon receipt, or storing raw materials in damaged packaging. For example, some polymers or lipids may lose their properties months before the official expiration date if not stored under optimal conditions. Damaged packaging also increases the risk of contamination or loss of seal integrity.
The solution is the implementation of a digital inventory management system with automatic alerts for upcoming expirations and batch tracking. The warehouse should be organized so that the oldest stocks are placed in easily accessible locations, with new stocks behind them. Packaging must be regularly inspected for mechanical damage, seal integrity, and label condition. When receiving raw materials, it is important to verify not only the expiration date but also the transportation conditions and packaging integrity. For sensitive raw materials, it is recommended to conduct regular stability tests according to standard test methods.
Photo: TECNIC Bioprocess Solutions / Unsplash
Overlooking Packaging Material Compatibility with Contents
Choosing the wrong packaging material can lead to chemical reactions, degradation, or contamination of pharmaceutical raw materials. For example, some organic solvents react with polyethylene-based plastics, causing them to swell or release monomers into the product. Similarly, metal containers may corrode in the presence of acidic or alkaline substances, resulting in contamination with metal ions. Before selecting packaging, it is essential to verify the material's compatibility with the specific raw material according to technical data sheets and manufacturer recommendations.
For sensitive substances such as vitamins or certain active pharmaceutical ingredients (APIs), packaging with an inert inner coating is often used, such as glass bottles with a protective layer or special polymers. It is also important to consider the packaging's permeability to gases, particularly oxygen and moisture, which can accelerate degradation. For substances prone to oxidation, the use of low-permeability packaging or the addition of oxygen absorbers to the enclosed space is recommended.
Inadequate Conditions During Transport and Handling Outside Storage
The stability of pharmaceutical raw materials can also be compromised during transport or handling outside controlled storage environments. Temperature fluctuations, vibrations, or impacts can cause physical changes such as crystallization, phase separation, or mechanical damage to packaging. For example, emulsions or suspensions may lose homogeneity when exposed to low temperatures for extended periods, while some powdered substances may clump at high temperatures.
To minimize risks, it is advisable to use transport containers with temperature control and shock-resistant design. For sensitive substances, it is recommended to monitor conditions throughout the entire transport route using data loggers that record temperature, humidity, and any shocks. It is also important to train personnel in proper handling to prevent excessive shaking or inappropriate storage of raw materials during transport interruptions.
Insufficient Documentation and Traceability of Changes
Missing or incomplete documentation can lead to uncertainties regarding the history of raw materials, making it difficult to identify the causes of potential degradation or contamination. According to Good Manufacturing Practice (GMP) principles, it is essential to maintain records for each batch of raw material, including the date of receipt, storage conditions, date of package opening, and all handling procedures. Without this information, it is impossible to reliably verify whether the raw material was stored in compliance with requirements.
It is recommended to implement a traceability system that allows for quick retrieval of all relevant raw material data, including the results of incoming inspections and any deviations. Modern software solutions can automatically record temperature and humidity conditions in the warehouse and alert when limits are exceeded. It is also important to regularly update documentation in line with changes in legislation or internal regulations to ensure compliance with REACH and other relevant regulations.
Do you need to ensure the stability of your raw materials?
Every pharmaceutical raw material requires an individual approach – from proper storage conditions to detailed documentation. GCG Group provides detailed Safety Data Sheets (SDS) and technical specifications for every supplied raw material to help you ensure its stability and safety throughout its use. Contact us – or browse our catalog of over 1,300 products right away.
