Pharmaceutical Contaminants in Aquatic Ecosystems

Pharmaceutical compounds enter rivers, lakes and coastal waters through domestic sewage, hospital effluents, agricultural run-off and pharmaceutical manufacturing discharges. Many active pharmaceutical ingredients (APIs) and their transformation products resist conventional treatment processes, leading to widespread detection in surface water, sediments and biota. Even at low concentrations, these compounds can disrupt endocrine systems, alter microbial communities and select for antimicrobial resistance. The risk is both local and global: hotspots often coincide with densely populated or industrial regions, yet long-range transport can expose remote ecosystems. Analytical advances now enable trace-level monitoring and non-target screening, revealing mixtures of analgesics, antibiotics, antidepressants and anti-inflammatories in water bodies worldwide. Despite growing scientific understanding, gaps remain in linking environmental concentrations to ecological effects, in standardising risk assessment thresholds and in developing cost-effective remediation strategies. Integrated approaches that combine improved wastewater treatment, source control and targeted monitoring are essential to safeguard aquatic health and mitigate public health risks associated with long-term exposure and resistance proliferation.

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Pharmaceutical Contaminants in Aquatic Ecosystems publication trend

The graph below shows the total number of articles in pharmaceutical contaminants in aquatic ecosystems across all publications each year (not limited to Nature Index journals).

Technical terms

Active Pharmaceutical Ingredient (API): The biologically active chemical compound in a drug formulation that can persist in the environment after use or disposal.

Predicted No-Effect Concentration (PNEC): An estimate of the substance concentration below which adverse effects on organisms or the environment are not expected to occur.

Wastewater Treatment Plant (WWTP): A facility designed to remove organic and inorganic contaminants from sewage and industrial effluents before releasing treated water into the environment.

Antimicrobial Resistance: The ability of microorganisms to survive exposure to antimicrobial agents, often driven by environmental concentrations of antibiotics that select for resistant strains.

References

1. A review on emerging contaminants in wastewaters and the environment: Current knowledge, understudied areas and recommendations for future monitoring. Water Research (2014).
2. Antibiotic concentrations and antibiotic resistance in aquatic environments of the WHO Western Pacific and South-East Asia regions: a systematic review and probabilistic environmental hazard assessment. The Lancet Planetary Health (2023).
3. Pharmaceutical pollution of the world’s rivers. Proceedings of the National Academy of Sciences of the United States of America (2022).
4. Antibiotic residues in final effluents of European wastewater treatment plants and their impact on the aquatic environment. Environment International (2020).