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Physiologically based pharmacokinetic (PBPK) modeling helps predict how drug absorption is affected by interactions, such as changes in gastric pH or food. This approach aids in assessing drug safety and efficacy during development.

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Area of Science:

  • Pharmacokinetics and Drug Metabolism
  • Drug Interactions and Safety
  • Computational Modeling in Pharmacology

Background:

  • Drug absorption is a critical factor in pharmacokinetics (PK) and ADME (absorption, distribution, metabolism, and excretion).
  • Drug-drug interactions (DDIs) during absorption can significantly alter drug PK, impacting safety and efficacy.
  • Physiologically based pharmacokinetic (PBPK) modeling is a valuable tool for assessing these absorption-mediated DDIs.

Purpose of the Study:

  • To review key mechanisms of oral absorption-mediated DDIs, focusing on gastrointestinal factors.
  • To illustrate the application of PBPK modeling in predicting and assessing absorption-mediated DDIs.
  • To discuss the regulatory acceptance and future directions of PBPK modeling in DDI assessment.

Main Methods:

  • Review of literature on oral absorption mechanisms and their impact on drug interactions.
  • Application of PBPK modeling to simulate and predict DDIs related to gastric pH, gastric emptying, gastrointestinal transit, and food effects.
  • Analysis of case studies and regulatory guidance from agencies like the FDA and EMA.

Main Results:

  • PBPK modeling effectively predicts DDIs arising from alterations in gastric pH, gastric transit, and food effects.
  • Case examples demonstrate the utility of PBPK in evaluating absorption-mediated DDI risks.
  • Regulatory bodies are increasingly accepting PBPK-based DDI assessments.

Conclusions:

  • PBPK modeling provides a mechanistic approach to assess absorption-mediated DDI risk, supporting drug development.
  • Focusing on gastrointestinal factors offers valuable insights into drug absorption variability.
  • Future integration with machine learning and global regulatory harmonization will further enhance PBPK applications.