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Related Concept Videos

Dose-Response Relationship: Potency and Efficacy01:22

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The potency of a drug is the measure of its ability to produce a biological response and can be compared by looking at the half-maximum effective concentration or EC50 values of different drugs. A lower EC50 value indicates higher potency of the drug. In the dose–response curve of two antihypertensive drugs, candesartan and irbesartan, a significant difference is observed in their EC50 values. A lower EC50 value for candesartan indicates that it is more potent than irbesartan, as it...
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Agonists can bind with and activate receptors, resulting in the formation of drug-receptor complexes. Once formed, these complexes catalyze many biochemical processes at the cellular level and subsequently induce a pharmacologic response. The degree of response is directly proportional to the fraction of activated receptors, which in turn, depends on the concentration of the drug at the receptor site as well as the sensitivity of the receptor. An increase in the administered dose contributes to...
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Dose Response Curve: Conventional Versus Nonmonotonic01:21

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The correlation between a drug's dosage and its impact on a biological system is a cornerstone of pharmacology and toxicology. Conventional dose–response curves, which include graded and quantal relationships, are key to this understanding. Graded dose–response curves depict the spectrum of a biological reaction to different doses within an individual, indicating that as the drug dosage increases, so does the intensity of the response. On the other hand, quantal dose–response...
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Toxicity Testing in Animals01:23

Toxicity Testing in Animals

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Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...
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Pharmacokinetic–Pharmacodynamic Relationship: Intensity of Dose-Effect Relationship01:23

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Pharmacodynamics explores the relationship between drug concentration and its effect. In a quantal response drug, the duration of action better correlates with drug concentration, while for graded effect drugs, the intensity of response is more relevant. This intensity depends on the dose, drug removal rate, and the region of the concentration–response curve.The concentration–response curve can be divided into three regions. Region 3 (80–100% maximum response) demonstrates...
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Bioavailability Study Design: Single Versus Multiple Dose Studies01:11

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Bioavailability studies are essential for understanding how a drug is absorbed, distributed, metabolized, and excreted in the body. These studies assess the extent and rate at which the active pharmaceutical agent becomes available at the site of action. The design of bioavailability studies can involve single-dose or multiple-dose regimens, each with distinct advantages and limitations.Single-dose studies are the preferred approach due to their simplicity and reduced drug exposure for...
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Dose response OECD 216 studies for agrochemicals.

Christopher J Sweeney1, Melanie Bottoms1, Kerry Hutcheson1

  • 1Syngenta, Jealott's Hill International Research Centre, Bracknell, Berkshire, UK.

Integrated Environmental Assessment and Management
|April 4, 2026
PubMed
Summary

The study found that dose response Organisation for Economic Co-operation and Development (OECD) test guideline 216 studies are feasible for agrochemicals, improving European soil microbial risk assessments by focusing on inhibitory effects.

Keywords:
OECD 216agrochemicaldose responserisk assessmentsoil microbiome

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Area of Science:

  • Environmental Science
  • Ecotoxicology
  • Microbiology

Background:

  • The Organisation for Economic Co-operation and Development (OECD) test guideline 216 is crucial for European pesticide risk assessment of soil microbiomes.
  • Current assessments use a threshold approach, but dose response designs are proposed for agrochemicals.

Purpose of the Study:

  • To explore the appropriate performance and interpretation of dose response OECD 216 studies for agrochemicals.
  • To compare endpoint calculation methods and assess the impact of study length and response interpretation.

Main Methods:

  • Conducted dose response OECD 216 nitrogen transformation tests on four agrochemicals.
  • Compared four methods for endpoint calculation.
  • Evaluated study length and the interpretation of stimulatory versus inhibitory responses.

Main Results:

  • Endpoint calculation method had minimal impact on ecotoxicological inference.
  • Hormetic responses observed in two compounds, indicating the system did not reach steady state within 28 days.
  • Test extensions beyond 28 days may be necessary.

Conclusions:

  • Dose response OECD 216 studies are viable for agrochemicals.
  • Focusing on inhibitory responses in dose response studies is recommended.
  • These studies offer a more refined approach to European soil microbial risk assessment.