Strategies for the Safe Management and Disposal of Unused and Expired Pharmaceuticals in Emergency and Post-Emergency Settings: A Comprehensive Review

Emergencies including natural disasters, disease outbreaks, conflicts, and humanitarian crises dramatically increase the demand for pharmaceuticals. Large volumes of medicines are donated, procured, or distributed rapidly to meet urgent health needs. While these interventions save lives, they also generate significant amounts of unwanted pharmaceuticals, including: Expired, medicines, partially used products, Contaminated or damaged pharmaceuticals, Overstocked donations, Returned or unused drugs from field operations, Temperature-compromised medicines (cold-chain failures) [1].

The disposal of these substances becomes especially challenging in crisis environments, where infrastructure is disrupted and health systems are overwhelmed. If improperly handled, pharmaceutical waste can contaminate soil and water, increase toxicity risks, promote antimicrobial resistance (AMR), and endanger civilians, health workers, and the environment.

Recognising these risks, the World Health Organization (WHO) issued the foundational document “Guidelines for Safe Disposal of Unwanted Pharmaceuticals in and after Emergencies.” These guidelines serve as a global reference for governments, humanitarian organisations, pharmacists, and emergency responders [2].

BACKGROUND AND RATIONALE [2-3].

Pharmaceutical waste management is a challenge even in stable health systems, but during emergencies, several factors amplify the problem:

1. Surge in Donations and Overstocking

• Humanitarian emergencies often lead to an influx of unsolicited pharmaceutical donations. Many donated drugs may be:
• Near expiry
• Unsuitable for local disease patterns
• Not registered in the recipient country
• Packaged in unfamiliar languages
• Non-essential or in excessive quantity
• These medicines cannot be used safely and thus accumulate as waste.

2. Damage from Disaster Events

Floods, fires, earthquakes, and cyclones can destroy storage facilities. Water-damaged, heat-exposed, or contaminated medicines become unsafe for use.

3. Breakdown of Supply Chains

In emergencies, transport and storage systems collapse. Cold-chain failures render vaccines and insulin unusable, contributing to pharmaceutical debris.

4. Improper Storage Conditions in Field Hospitals

Temporary clinics, mobile units, and makeshift storage locations may lack:

• Temperature control
• Protection from weather
• Secure shelving
• Pest control
• These conditions promote rapid degradation and waste accumulation.

5. Environmental and Public Health Risks

• Unsafe disposal such as dumping pharmaceuticals in open landfills, burning them at low temperature, or flushing into sewers can lead to:
• Groundwater contamination
• Accidental poisoning
• Toxic emissions
• Increased antimicrobial resistance
• Long-term ecological damage
• Thus, scientifically sound disposal practices are a critical aspect of emergency preparedness.

TYPES OF PHARMACEUTICAL WASTE IN EMERGENCIES [4].

Pharmaceutical waste in emergencies is diverse and requires precise classification to guide safe disposal.

WHO recommends that safe pharmaceutical disposal should be guided by the following core principles:

Table: -1 WHO core principles [6-8].

The WHO provides a structured hierarchy of disposal methods prioritising safety, environmental protection, and feasibility in resource-limited emergency settings. The method chosen must consider the pharmaceutical type, volume, local infrastructure, environmental regulations, and risk of diversion.

High-Temperature Incineration (Best Method)

High-temperature incineration (HTI) is considered the gold standard for pharmaceutical destruction.

Temperature Requirements

850–1200°C for general pharmaceuticals

>1200°C for cytotoxic drugs

Advantages

Effective destruction of active ingredients

Significant volume reduction (up to 95%)

Minimal environmental release when properly controlled

 Limitations

• Rarely available in low-income or crisis environments
• Expensive to operate
• Requires trained staff, emission controls, and monitoring
• HTI facilities are usually located in industrial zones, cement plants, or large hospitals.

 Medium-Temperature Incineration

Used when high-temperature units are not available.

Temperature Range 400–800°C

Suitable for

• Antibiotics
• Analgesics
• Vitamins
• Oral solids
• Non-hazardous liquids

Concerns

Incomplete combustion can release toxic gases (dioxins, furans). WHO recommends this method only when HTI is unavailable.

Cement Kiln Co-Processing

An environmentally sound method used widely in emergencies.

Cement kilns operate at 1400–1600°C, ensuring complete destruction.

Pharmaceuticals are fed into the kiln with clinker materials.

No additional emissions because the process already uses high temperatures.

Advantages

• Safe and efficient
• Large capacity
• Good for bulk waste disposal

Limitations

• Requires agreement with cement plant operators
• Transportation logistics must be secure

Encapsulation

This method involves the safe containment of pharmaceutical waste by encapsulating medicines within concrete-filled drums, thereby preventing environmental contamination. The process entails placing the pharmaceuticals into a large drum, adding immobilising materials such as cement, lime, and sand, and then sealing the drum with concrete before burial in a controlled landfill. This approach is particularly suitable for solid dosage forms, antibiotics, and short-term disposal of controlled medicines, offering a low-cost and effective means of secure pharmaceutical waste management[11].

Advantages

• Prevents leaching
• Simple and inexpensive

Limitations

• Not suitable for liquids
• Not ideal for cytotoxic waste

Inertisation

Inertisation is a pharmaceutical waste disposal method similar to encapsulation, where medicines are first ground and then mixed with a cement-lime mixture to form a stable, inert mass. This technique is particularly suitable for tablets, capsules, and combustible medicines, providing a safe and environmentally sound approach for the management of solid pharmaceutical waste [10].

Suitable for

• Tablets and capsules
• Combustible medicines

Advantages

• Safe stabilization
• Often used in emergencies

Limitations

• Labour-intensive
• Generates dust contamination if poorly executed

5.6 Chemical Degradation (Specialized Method)

Chemical degradation is a specialized technique for the disposal of pharmaceutical waste, wherein active pharmaceutical compounds are neutralized through the application of chemical agents such as potassium permanganate or bleach. This method is particularly suited for liquid pharmaceuticals, certain antineoplastic drugs, and disinfectants that cannot be safely disposed of through conventional means like incineration or landfilling. The process ensures that the bioactive or toxic properties of the waste are effectively destroyed, minimizing risks to human health and the environment. However, due to the technical complexity, need for careful handling of reactive chemicals, and requirement for controlled conditions, chemical degradation is generally not recommended for large-scale emergencies or mass pharmaceutical disposal [12-13].

Controlled Landfilling

Controlled landfilling is a method of pharmaceutical waste disposal in which medicines are securely buried in engineered landfill sites designed to minimize environmental contamination. In this approach, pharmaceutical waste particularly solid dosage forms, non-hazardous liquids, and expired or unused products is collected, segregated, and sometimes pretreated (e.g., immobilized or encapsulated) before being deposited in designated landfill cells[14]. These landfills are engineered with protective liners, leachate collection systems, and monitoring mechanisms to prevent the infiltration of hazardous substances into soil and groundwater. Controlled landfilling is considered a safe and practical method for managing pharmaceutical waste that cannot be incinerated or chemically degraded, especially in situations where other specialized disposal methods are not feasible. While it is relatively low-cost and effective for long-term containment, careful site selection, regulatory compliance, and ongoing environmental monitoring are essential to ensure that buried pharmaceuticals do not pose future health or ecological risks. This method is particularly useful for large volumes of non-hazardous or low-toxicity pharmaceutical waste generated in healthcare facilities and during emergency response operations [15].

PHARMACEUTICAL DISPOSAL DURING ACTIVE EMERGENCIES

During active emergencies such as natural disasters, epidemics, or humanitarian crises, large volumes of pharmaceutical products including expired, unused, damaged, or surplus medicines accumulate rapidly. Improper disposal in such situations can pose significant risks to human health, the environment, and public safety. Emergency contexts present unique challenges, including limited infrastructure, time constraints, and the urgent need to prevent diversion or misuse of controlled substances.

Effective disposal during active emergencies relies on a combination of strategies tailored to the type and hazard level of the pharmaceutical waste:

1. Segregation and Inventory Control: Medicines should be categorized by type, hazard level, and expiry to facilitate safe handling and disposal.
2. Low-Cost Containment Methods: Techniques such as immobilization in concrete-filled drums or inertisation allow secure containment of solid and combustible pharmaceuticals when other disposal options are limited.
3. Chemical Degradation: For liquid pharmaceuticals or potent antineoplastics, controlled chemical neutralization may be employed, though this method is technically complex and limited to small volumes.
4. Controlled Landfilling: Pre-treated or non-hazardous pharmaceuticals can be safely disposed of in engineered landfill sites with protective measures to prevent environmental contamination.
5. Regulatory Compliance and Documentation: Even in emergencies, adherence to local, national, and WHO guidelines is crucial, along with proper record-keeping to track disposal activities and prevent misuse [16].

ENVIRONMENTAL AND PUBLIC HEALTH IMPACTS

Improper disposal of pharmaceutical waste has far-reaching consequences for both environmental and public health. Pharmaceuticals, particularly active pharmaceutical ingredients (APIs), can enter soil, surface water, and groundwater through leaching from landfills, improper incineration, or accidental spillage. This contamination may lead to the accumulation of bioactive compounds in aquatic organisms, disrupt ecosystems, and alter microbial populations. Antibiotics present in wastewater contribute to the development and spread of antimicrobial resistance (AMR), posing a global health threat. Cytotoxic drugs and antineoplastics, if released into the environment, may cause toxicity in non-target species and long-term ecological damage.

Controlled substances, narcotics, and psychoactive medications disposed of improperly can lead to accidental human exposure, poisoning, or illicit diversion. Even unused or expired medicines, though seemingly benign, can contribute to chronic low-level environmental contamination and potential health hazards when present in large quantities [17].

POLICY FRAMEWORKS AND REGULATORY GUIDELINES [18-19].

Effective pharmaceutical waste disposal requires strong policy frameworks supported by national legislation.