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Related Concept Videos

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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Toxicokinetics: Overview01:21

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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...
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Choosing the appropriate route of drug administration is significantly influenced by two key factors: the therapeutic objectives and the inherent properties of the drug being used.
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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.
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Drug Delivery: Miscellaneous Routes01:22

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Drug delivery methods like oral inhalation, nasal sprays, transdermal patches, eye drops, intravitreal injection,  and rectal administration provide localized effects with reduced toxicity.
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Inhalational Anesthetics: Overview01:20

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Inhalation anesthetics are drugs that induce general anesthesia upon inhalation. They work by increasing the sensitivity of GABAA receptors or inhibiting NMDA receptors, leading to a decrease in central nervous system activity. The depth of anesthesia can be rapidly adjusted by changing the concentration of the inhaled gas. Some common examples of inhalational anesthetics include volatile liquids like isoflurane, desflurane, sevoflurane and gases like xenon and nitrous oxide. Isoflurane, a...
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Toxicology Studies for Inhaled and Nasal Delivery.

R K Wolff1

  • 1RK Wolff - Safety Consulting Inc, Fort Myers, Florida 33907, United States.

Molecular Pharmaceutics
|April 28, 2015
PubMed
Summary

This review highlights challenges in pharmaceutical toxicology testing for inhalation and nasal drug delivery. Key issues include unique dosing methods and complex dose determination for accurate safety assessments in animal studies.

Keywords:
MMADaerosolsexcipientsinhalation toxicologyinhaled pharmaceuticallungnasalpulmonaryrespiratory tract toxicity

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Area of Science:

  • Pharmacology
  • Toxicology
  • Drug Delivery Systems

Background:

  • Pharmaceuticals are increasingly delivered via inhalation or nasal routes.
  • Ensuring the safety of these drug delivery methods requires robust toxicological testing.
  • Standard toxicological assessment methods may not directly apply to these routes.

Purpose of the Study:

  • To review and identify key challenges in toxicological testing for inhalation and nasal drug delivery.
  • To discuss unique issues related to animal study design and dose determination for these routes.
  • To inform the development of improved safety assessment strategies for inhaled and intranasal pharmaceuticals.

Main Methods:

  • Literature review of existing toxicological testing methodologies.
  • Analysis of unique challenges in inhalation and nasal administration.
  • Discussion of dose determination complexities in animal models.

Main Results:

  • Inhalation toxicology studies present unique dosing challenges compared to oral or injection routes.
  • Accurate dose determination for inhaled pharmaceuticals is complex, affecting both patient and animal study outcomes.
  • Existing methods require adaptation to address the specificities of non-oral/non-injection routes.

Conclusions:

  • Toxicological testing for inhalation and nasal drug delivery requires specialized approaches.
  • Addressing dosing and dose determination complexities is crucial for accurate safety evaluations.
  • Further research and methodological refinement are needed to optimize safety assessments for these delivery routes.