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Individual variation in first-pass metabolism

Y K Tam1

  • 1Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Canada.

Clinical Pharmacokinetics
|October 1, 1993
PubMed
Summary

Individual drug metabolism varies significantly, especially for drugs with extensive first-pass metabolism. Key factors influencing this variability include genetic polymorphism, enzyme induction/inhibition, and food effects, impacting drug therapy optimization.

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Area of Science:

  • Pharmacology
  • Drug Metabolism
  • Pharmacokinetics

Background:

  • Individual variation in drug pharmacokinetics is well-established.
  • This variability is particularly pronounced for drugs undergoing extensive first-pass metabolism.
  • The liver, gut, and lung all contribute to first-pass metabolism, but quantifying gut and lung contributions is challenging.

Purpose of the Study:

  • To explore the factors contributing to variability in drug pharmacokinetics.
  • To highlight the significance of first-pass metabolism in drug variability.
  • To emphasize the need for understanding variability sources for optimizing drug therapy.

Main Methods:

  • Review of existing literature on drug metabolism and pharmacokinetics.
  • Analysis of factors influencing first-pass metabolism, including genetic, environmental, and physiological aspects.
  • Examination of specific drug examples illustrating variability.

Main Results:

  • First-pass metabolism significantly contributes to pharmacokinetic variability.
  • Major contributors to variability include genetic polymorphism, enzyme induction/inhibition, and food effects.
  • Age and gender have less pronounced effects compared to other factors.

Conclusions:

  • Understanding the sources of pharmacokinetic variability is crucial for optimizing drug therapy.
  • Factors like genetic polymorphism and food-drug interactions can cause several-fold variations in drug concentrations.
  • Further research is needed to precisely quantify the contributions of different organs and factors to first-pass metabolism.

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