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Ecotoxicological quantitative structure-activity relationships for pharmaceuticals.

Hans Sanderson1, Marianne Thomsen

  • 1National Environmental Research Institute, Department of Policy Analysis, Aarhus University, Frederiksborgvej 399, Post Box 358, Roskilde 4000, Denmark. hasa@dmu.dk

Bulletin of Environmental Contamination and Toxicology
|August 19, 2007
PubMed
Summary

Most active pharmaceutical ingredients (APIs) exhibit acute ecotoxicity via non-specific narcosis. Current models may overestimate toxicity, necessitating new methods for chronic ecotoxicity assessment of pharmacodynamic APIs.

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Area of Science:

  • Environmental Chemistry
  • Ecotoxicology
  • Pharmaceutical Science

Background:

  • Active pharmaceutical ingredients (APIs) are increasingly detected in aquatic environments.
  • Understanding the ecotoxicological modes of action (MOA) of APIs is crucial for environmental risk assessment.
  • Non-specific narcosis is a common MOA for many organic chemicals.

Purpose of the Study:

  • To investigate the acute ecotoxicological modes of action (MOA) of 59 active pharmaceutical ingredients (APIs).
  • To evaluate the applicability of narcosis as a predictive model for API ecotoxicity.
  • To identify limitations in current assessment methods for chronic ecotoxicity.

Main Methods:

  • Analysis of excess toxicity ratios for 59 APIs.
  • Comparison of predicted ecotoxicity based on a narcotic model versus observed data.
  • Examination of the relationship between Log EC(50) and Log K(ow) for APIs.

Main Results:

  • 85% of the studied APIs exhibited an excess toxicity ratio less than 7, indicating narcosis as a primary MOA.
  • Ecotoxicity of 70% of APIs was overestimated by a simple narcotic model.
  • Regression slopes of Log EC(50)-Log K(ow) for most APIs fell within the universal narcosis range (-0.49 to -0.86).

Conclusions:

  • Non-specific narcosis is the predominant acute ecotoxicological MOA for the majority of tested APIs.
  • Hydrophobicity, while relevant for acute toxicity, may not be a suitable descriptor for assessing the chronic ecotoxicity of pharmacodynamic APIs.
  • Development of novel experimental methods is required for accurate assessment of chronic ecotoxicity of pharmacodynamic APIs.