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Does the well-stirred model assess the intestinal first-pass effect well?

Takashi Mizuma1, Akira Tsuji, Masahiro Hayashi

  • 1Department of Drug Absorption and Pharmacokinetics, School of Pharmacy, Tokyo University of Pharmacy and Life Science (TUPLS), 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan. mizuma@ps.toyaku.ac.jp

The Journal of Pharmacy and Pharmacology
|November 27, 2004
PubMed
Summary
This summary is machine-generated.

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The well-stirred model underestimates intestinal extraction ratio (E(g)) by omitting membrane transport. Incorporating membrane transport into pharmacokinetic models provides a more accurate E(g) assessment for drugs like metoprolol.

Area of Science:

  • Pharmacokinetics
  • Drug Metabolism
  • Physiologically Based Pharmacokinetic (PBPK) Modeling

Background:

  • The pre-systemic intestinal extraction ratio (E(g)) is crucial for oral drug bioavailability.
  • Current estimations often rely on the well-stirred model, which lacks membrane transport considerations.

Purpose of the Study:

  • To identify the limitations of the well-stirred model in assessing E(g).
  • To evaluate the impact of membrane transport on E(g) estimations.
  • To propose an improved pharmacokinetic modeling approach for E(g).

Main Methods:

  • Assessed E(g) for metoprolol (a CYP2D6 substrate) using three distinct methods.
  • Employed a model-independent method using bioavailability data.
  • Utilized the well-stirred model equation.

Related Experiment Videos

  • Applied the transport-metabolism-flow (TMF) model equation.

    • Main Results:

    • The model-independent method yielded an E(g) of 0.228.
    • The well-stirred model significantly underestimated E(g) at 0.0071.
    • The TMF model provided a closer estimate (E(g) = 0.213) compared to the well-stirred model.

    Conclusions:

    • The well-stirred model is inadequate for accurate E(g) assessment due to its exclusion of membrane transport.
    • The TMF model, incorporating membrane transport, offers a more precise estimation of E(g).
    • Pharmacokinetic models should include membrane transport parameters for improved pre-systemic drug extraction ratio evaluation.