When Medicines Meet Climate Change: Implications for Health and Sustainability

Health and climate change are deeply interconnected, with each influencing the other in complex and far-reaching ways. Climate change is not only an environmental issue but a growing public health challenge, affecting disease patterns, healthcare systems, and the well-being of vulnerable populations. As a pharmacy student, my training has largely centered on the safe, effective, and rational use of medicines to improve patient outcomes. However, as my understanding of global health deepens, I have become increasingly aware that the benefits of pharmaceuticals come with an often-overlooked cost their impact on the environment.

From lecture discussions on drug production to my exposure to community health outreach, I have come to recognize that medicines do not only interact with the human body; they also interact with ecosystems and are themselves vulnerable to climate-related disruptions.

The environmental footprint of medicines spans their entire lifecycle. Pharmaceutical manufacturing contributes to greenhouse gas emissions, while global supply chains increase carbon burdens.

Climate change further disrupts these systems through extreme weather events, leading to production delays and shortages of essential medicines, while also threatening the availability of raw materials used in drug production. For example, disruptions in manufacturing caused by hurricanes have previously led to global shortages of essential medical supplies, highlighting the fragility of pharmaceutical supply chains. Furthermore, the availability of natural raw materials used in drug production may decline due to environmental stress, further complicating access to essential medicines.

Beyond supply, climate change also affects the quality and use of medicines.

Rising temperatures and humidity levels can degrade heat-sensitive medicines such as vaccines, insulin, and blood products, especially in regions with weak or unreliable cold chain systems. This is particularly concerning in low- and middle-income countries, where access to stable electricity and storage infrastructure is limited. In such cases, compromised medicine quality can lead to reduced efficacy and potential safety risks. For instance, drugs like oxytocin, used to prevent postpartum hemorrhage, require strict temperature control, and their degradation can have life-threatening consequences.

The development of heat-stable alternatives highlights the need for innovation in climate-resilient pharmaceuticals. Climate change affects not only the supply but also the quality and use of medicines. Heat-sensitive medicines such as vaccines, insulin, and oxytocin are particularly at risk in settings with weak cold chain systems, reducing their effectiveness and posing serious health risks. Improper disposal of medicines such as flushing drugs down the toilets or discarding them with general waste contributes to environmental pollution, harming ecosystems and accelerating antimicrobial resistance AMR  microorganisms adapt and become resistant to treatment.

This highlights the urgent need for proper medicine disposal systems, such as take-back programs, and increased public awareness of environmentally responsible practices. Concentrations of antibiotics in the environment also accelerates antimicrobial resistance (AMR), as microorganisms adapt and become resistant to treatment. This highlights the urgent need for proper medicine disposal systems, such as take-back programs, and increased public awareness of environmentally responsible practices.

Climate change also alters patterns of medicine use. As temperatures rise and disease patterns shift, there is an increasing burden of both infectious and non-communicable diseases. This leads to higher demand for medications, including antibiotics, cardiovascular drugs, and respiratory treatments. However, changes in temperature can also affect how medicines act in the body. For example, heatwaves can intensify the effects of certain drugs, such as insulin , increasing the risk of adverse outcomes like hypoglycemia or dangerously low blood pressure.

Another critical concern is the link between climate change and antimicrobial resistance (AMR). Rising temperatures and increased spread of infectious diseases contribute to greater use of antimicrobials in both humans and animals. At the same time, environmental factors such as heat and humidity can degrade medicines, resulting in sub-therapeutic doses that promote the development of resistant microorganisms. Pharmaceutical pollution further exacerbates this issue, reinforcing the urgent need for sustainable and responsible medicine management.

Importantly, the impact of climate change on medicines extends beyond human health to include animal and environmental health, reinforcing the One Health perspective. Changes in climate affect livestock diseases, which may increase the use of veterinary medicines and contribute to drug residues in food systems. These interconnected effects highlight that environmental degradation ultimately affects the health of humans, animals, and ecosystems alike.

In response to these challenges, the International Pharmaceutical Federation (FIP) advocates for a dual approach: mitigation and adaptation. Mitigation strategies focus on reducing the environmental impact of pharmaceutical practices through rational medicine use, green chemistry, and proper disposal systems such as take-back programs. Adaptation strategies emphasize strengthening health system resilience by improving disaster preparedness, ensuring medicine supply continuity, and investing in climate-resilient innovations such as heat-stable drugs and robust cold chain systems.

Sustainable pharmacy practices are therefore essential not only for environmental protection but also for safeguarding public health. My experiences in community outreach have reinforced this connection, as I have seen how environmental conditions directly influence health outcomes and access to care, particularly among vulnerable populations. Raising awareness among patients, communities, and future healthcare professionals about the environmental impact of medicines is critical. Education campaigns, community outreach, and advocacy initiatives can empower individuals to adopt sustainable practices that protect both health and the environment.

In conclusion, the pharmacy profession stands at a critical intersection of healthcare and environmental sustainability. While medicines remain indispensable, their environmental impact and vulnerability to climate change must be addressed urgently. Pharmacy professionals, students, and policymakers must take collective action to promote sustainable practices, invest in resilient health systems, and support innovation in climate-adaptive medicines. Protecting planetary health is not optional it is an essential extension of our duty to care. Only through deliberate and coordinated efforts can we ensure that medicines continue to save lives without compromising the health of our planet and future generations.

Angel Naa Odarley Lawson

Education and Awareness Intern

Frontline for Climate action.