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Theories of Dissolution: Diffusion Layer Model01:15

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Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
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Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are...
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Factors Influencing Drug Absorption: Drug Dissolution01:27

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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: Pharmaceutical Parameters01:28

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Solid dosage forms such as tablets and capsules undergo rigorous manufacturing processes to ensure stability and effectiveness. Their dissolution and absorption properties are influenced significantly by the choice of excipients (inactive ingredients that serve various roles in the formulation), and the methodology applied during production. The manufacturing parameters, such as compression force and granulation techniques, significantly affect dissolution rates. Elevated compression forces...
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Methods for Studying Drug Absorption: In vitro01:16

Methods for Studying Drug Absorption: In vitro

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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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Methods for Studying Drug Absorption: In situ01:09

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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.
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Development of In Vitro Dissolution Testing Methods to Simulate Fed Conditions for Immediate Release Solid Oral

Timothy R Lex1, Jason D Rodriguez1, Lei Zhang2

  • 1Division of Complex Drug Analysis, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, St. Louis, Missouri, 63110, USA.

The AAPS Journal
|March 12, 2022
PubMed
Summary

In vitro dissolution testing aims to predict oral drug performance in the GI tract. Current biorelevant models improve physiological relevance but face challenges in fully replicating conditions and in vitro-in vivo translatability.

Keywords:
bioequivalencedissolutionfed statein vitro model(s)oral drugphysiological model(s)

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Area of Science:

  • Pharmacokinetics and Drug Delivery
  • Gastrointestinal Physiology
  • Pharmaceutical Sciences

Background:

  • In vitro dissolution testing is crucial for predicting oral drug product performance in the gastrointestinal (GI) tract.
  • Simulating in vivo conditions, especially under fasted and fed states, is essential for accurate predictions.
  • Immediate release (IR) solid oral dosage forms are the primary focus for these dissolution studies.

Purpose of the Study:

  • To review current in vitro dissolution methodologies for simulating and predicting in vivo drug dissolution under fasted and fed conditions.
  • To assess biorelevant systems and physiologically based pharmacokinetic (PBPK) modeling approaches.
  • To identify knowledge gaps and facilitate the development of improved in vitro dissolution methods.

Main Methods:

  • Literature review of in vitro dissolution testing methodologies and biorelevant models.
  • Summary of human GI physiological conditions under fasted and fed states.
  • Assessment of PBPK modeling in evaluating food effects on drug bioavailability and bioequivalence.

Main Results:

  • Dissolution media, mechanical forces, and transit times are key parameters for simulating postprandial conditions.
  • Various biorelevant systems (FSM, GastroDuo, DGM, TIM, HGS) exist but often lack full physiological replication.
  • Translatability of in vitro data to in vivo systems remains a significant challenge.

Conclusions:

  • While biorelevant models enhance physiological relevance, challenges in full replication and in vitro-in vivo correlation persist.
  • PBPK modeling offers a complementary approach to assess food effects on drug performance.
  • Further development of in vitro dissolution methods is needed to accurately predict in vivo drug performance under fasted and fed states, potentially harmonizing regulatory studies.