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Evaluating drug absorption after oral administration. Some problems and some solutions.

K K Chan, M Gibaldi

European Journal of Clinical Pharmacology

|January 1, 1984

Summary

Accurately assessing oral drug absorption is challenging due to complex drug disposition. The statistical moments method offers a preferable alternative for quantitative drug absorption analysis, especially when first-order absorption is assumed.

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Area of Science:

Pharmacokinetics
Drug Absorption Modeling

Background:

Quantitative assessment of drug absorption after oral administration is complex.
Challenges include non-obvious multiple-compartment drug disposition and indistinguishable macroconstants.
Analysis without an intravenous reference curve often yields limited information for in vivo-in vitro correlations.

Purpose of the Study:

To address the difficulties in quantitative drug absorption assessment.
To explore alternative methods for analyzing oral drug absorption data.
To identify methods suitable for in vivo-in vitro correlation development.

Main Methods:

Comparison of compartment modeling approaches (e.g., Loo-Riegelman) requiring intravenous reference data.
Evaluation of the model-independent statistical moments method as an alternative.

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Assumption of first-order absorption for the statistical moments method.

Main Results:

Compartment models require corresponding intravenous reference curves for accurate oral data analysis.
The statistical moments method is computationally easier and potentially less error-prone.
Model-independent methods offer a viable alternative when assumptions are met.

Conclusions:

Accurate quantitative drug absorption analysis is hindered by complex disposition kinetics.
The statistical moments method is a preferable alternative for drug absorption assessment.
This method is particularly useful when first-order absorption kinetics can be assumed.