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Related Concept Videos

Non-Oral Extravascular Drug Absorption Routes01:15

Non-Oral Extravascular Drug Absorption Routes

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Non-oral extravascular routes, which encompass sublingual, buccal, topical, intramuscular, and inhalation methods, primarily utilize passive diffusion to transport drugs into the systemic circulation. The absorption rates and effectiveness of these routes depend on the drug's physicochemical properties, as well as the patient's anatomical and pathophysiological state.
Lipophilic drugs that are stable at salivary pH (6) and exhibit minimal binding to the oral mucosa are absorbed more...
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Factors Influencing Drug Absorption: Drug Dissolution01:27

Factors Influencing Drug Absorption: Drug Dissolution

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The pharmacokinetic journey of drugs from solid oral dosage forms into systemic circulation is multifaceted. It begins with disintegration, a prerequisite ensuring a solid dosage form's subdivision into minute particles. Dissolution occurs next as these granulated entities solubilize in gastrointestinal fluids. This solubilization is crucial for the succeeding stage, permeation, which describes the traversal of the drug across the intestinal membrane and its subsequent entry into the blood...
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Factors Influencing Drug Absorption: Physicochemical Parameters01:22

Factors Influencing Drug Absorption: Physicochemical Parameters

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The physicochemical characteristics of drugs play a crucial role in formulating stable and bioavailable drug products. The solubility of a drug, governed by the varying pH along the GI tract and its dissociation constant (pKa), is pivotal in determining its ionization state and absorption rate. Notably, weak acids and bases remain unionized and are absorbed more rapidly.
Enhanced drug absorption can be achieved by reducing particle sizes and increasing surface areas, thereby facilitating...
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Methods for Studying Drug Absorption: In situ01:09

Methods for Studying Drug Absorption: In situ

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In situ experiments, such as the Doluisio method and Single-Pass Perfusion technique, provide critical insights into drug uptake by simulating in vivo conditions for drug absorption.
The Doluisio method involves perfusing a prepared segment of a rat's small intestine with a solution of radiolabeled drug and a non-absorbable marker. This helps to differentiate between absorbed and non-absorbed drug concentrations. The intestinal segment is connected at both ends using tubing and syringes,...
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Drug Absorption: Overview01:17

Drug Absorption: Overview

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The process of drug absorption signifies the transition of a drug from its site of administration into the plasma. This process is influenced by various factors, including the route of administration, the anatomy of the absorption site, the mechanism of absorption, gut motility, and the drug's physicochemical properties.
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Methods for Studying Drug Absorption: In vitro01:16

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In vitro experiments are crucial for understanding the transport and absorption of drugs through biological materials. These studies employ varied methods such as the diffusion cell method, the everted sac technique, and the everted ring technique.
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Updated: Dec 16, 2025

Visualizing and Quantifying Pharmaceutical Compounds within Skin using Coherent Raman Scattering Imaging
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Guidance on dermal absorption.

, Harrie Buist, Peter Craig

    EFSA Journal. European Food Safety Authority
    |July 7, 2020
    PubMed
    Summary
    This summary is machine-generated.

    This guidance helps assess dermal absorption for plant protection products (PPPs). It provides methods for determining absorption values crucial for risk assessments, using updated data and a tiered approach.

    Keywords:
    default valuesdermal absorptionin vitroin vivoplant protection productstriple pack

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    Area of Science:

    • Environmental Science
    • Toxicology
    • Risk Assessment

    Background:

    • Dermal absorption is critical for plant protection product (PPP) risk assessment.
    • Previous guidance on dermal absorption assessment was issued in 2012 and revised in 2017.
    • The current guidance builds upon the 2011 EFSA Scientific Opinion on dermal absorption.

    Purpose of the Study:

    • To provide updated guidance on assessing dermal absorption of active substances in PPPs.
    • To assist notifiers, test facilities, and authorities in setting dermal absorption values for risk assessments.
    • To clarify aspects of dermal absorption studies, including interpretation and reporting.

    Main Methods:

    • Review and integration of new human in vitro dermal absorption data for PPPs.
    • Development of a tiered approach for dermal absorption assessment, including default values and data from related products or animal studies.
    • Inclusion of flow charts to aid in the application of the guidance.
    • Recommendations for study design and reporting to reduce variation and improve interpretation.

    Main Results:

    • Updated recommendations for performing and interpreting dermal absorption studies specific to PPPs.
    • A tiered strategy for dermal absorption assessment, prioritizing human in vitro data.
    • Guidance on handling situations with limited or no available dermal absorption data for the product under evaluation.

    Conclusions:

    • The revised guidance offers a robust framework for dermal absorption assessment in PPP risk evaluation.
    • Emphasis is placed on using human in vitro data as the preferred method for estimating dermal absorption.
    • The guidance aims to ensure consistent and reliable risk assessments for plant protection products.