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Related Concept Videos

Types of Toxins01:36

Types of Toxins

Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
Toxic Reactions: Overview01:26

Toxic Reactions: Overview

When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
Drug Toxicity: Overview01:00

Drug Toxicity: Overview

Drug toxicity quantifies the harm a compound causes to an organism, varying by dose and potentially impacting whole systems or specific organs like the liver. Toxic reactions may arise from venomous insect or spider bites, with effects ranging from mild symptoms to severe outcomes such as brain damage or death. Common forms of acute poisoning include ethanol intoxication and overdose of pain or fever medications, with substances like GHB and heroin being particularly lethal at doses close to...
Drug Toxicity: Dose-Dependent Reactions01:24

Drug Toxicity: Dose-Dependent Reactions

Drug toxicities can be stratified into pharmacological, pathological, or genotoxic based on their mechanisms. The incidence and severity of these toxicities generally increase with the drug's concentration in the body and exposure time.Pharmacological toxicity is evident when the therapeutic effects of drugs overshoot into adverse reactions in a predictable, dose-dependent manner. Central nervous system (CNS) depression from barbiturates is a classic example, with effects escalating from...
Toxicokinetics: Overview01:21

Toxicokinetics: Overview

Studies that assess how a drug is absorbed, distributed, metabolized, and excreted (ADME) at toxic doses are termed toxicokinetics. Understanding toxicokinetics helps predict adverse drug reactions (ADRs) and manage toxicity in humans.Toxicokinetics differs from pharmacokinetics mainly in the dose levels studied, with toxicokinetics focusing on higher toxic doses. The kinetics at these levels can be non-linear due to altered physiological processes. Toxicodynamics examines the relationship...
Toxicity Testing in Animals01:23

Toxicity Testing in Animals

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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Related Experiment Video

Updated: Jun 25, 2026

Experimental Protocol for Using Drosophila As an Invertebrate Model System for Toxicity Testing in the Laboratory
06:00

Experimental Protocol for Using Drosophila As an Invertebrate Model System for Toxicity Testing in the Laboratory

Published on: July 10, 2018

Toxicology: then and now.

Loralie J Langman1, Bhushan M Kapur

  • 1Division of Clinical Biochemistry and Immunology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN 55905, USA.

Clinical Biochemistry
|May 30, 2006
PubMed
Summary

This review details the historical evolution of toxicology, from its origins to modern molecular-level insights. It highlights advancements in analytical techniques for drug analysis and therapeutic drug management.

Area of Science:

  • Toxicology
  • Forensic Toxicology
  • Clinical Toxicology

Background:

  • The science of toxicology, the study of poisons, has ancient roots but was formalized by Paracelsus and Orfila.
  • Modern toxicology utilizes sophisticated scientific methods to investigate toxic exposures and their effects.
  • 20th-century discoveries, including DNA and biochemical pathways, advanced understanding of cellular functions and toxic impacts.

Purpose of the Study:

  • To review the historical progression of clinical and forensic toxicology.
  • To explore the evolution of analytical techniques in drug analysis.
  • To examine advancements in understanding toxic effects at the molecular level.

Main Methods:

  • Historical review of clinical and forensic toxicology.

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Assessment of Chemical Toxicity in Adult Drosophila Melanogaster
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Assessment of Chemical Toxicity in Adult Drosophila Melanogaster

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  • Exploration of analytical techniques in drug analysis across various biological matrices.
  • Discussion of therapeutic drug management, workplace drug testing, and pharmacogenetics.

    • Main Results:

    • Significant advancements in understanding toxicology from historical to molecular levels.
    • Development of sophisticated analytical techniques for drug detection and quantification.
    • Integration of pharmacodynamic monitoring and pharmacogenetics in toxicological assessments.

    Conclusions:

    • Toxicology has evolved significantly, offering deeper insights into poison effects.
    • Modern analytical methods enhance accuracy in drug analysis and clinical toxicology.
    • Future directions involve molecular-level understanding and personalized medicine approaches in toxicology.