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Related Experiment Videos

Instantaneous input hypothesis in pharmacokinetic studies.

W L Chiou1, G Lam, M L Chen

  • 1Department of Pharmacy, College of Pharmacy, University of Illinois, Chicago 60612.

Journal of Pharmaceutical Sciences
|September 1, 1981
PubMed
Summary

This study compared observed drug plasma concentrations to extrapolated values, finding significant early deviations. These pharmacokinetic data highlight the need for careful interpretation of drug distribution models.

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Area of Science:

  • Pharmacokinetics
  • Drug Metabolism and Distribution
  • Biopharmaceutics

Background:

  • The instantaneous input hypothesis is a common model for drug distribution.
  • Accurate pharmacokinetic data is crucial for drug development and dosing.
  • Early plasma concentrations can significantly impact model predictions.

Purpose of the Study:

  • To compare observed venous plasma drug concentrations with those extrapolated using the instantaneous input hypothesis.
  • To evaluate the accuracy of the instantaneous input hypothesis in early post-injection phases.
  • To assess the implications for pharmacokinetic data interpretation.

Main Methods:

  • Intravenous bolus injections of furosemide, propranolol, griseofulvin, and theophylline were administered to unanesthetized dogs.

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  • Venous plasma concentrations were measured at 0.33 and 0.66 minutes post-injection.
  • Observed concentrations were compared to values extrapolated using the instantaneous input hypothesis.

    • Main Results:

    • Extrapolated to observed plasma level ratios varied significantly, reaching as high as 226 for griseofulvin at 0.33 minutes.
    • Plasma levels peaked at 1 minute post-injection across all studied drugs.
    • Total plasma areas under the curve (AUC) were overestimated by up to 19.6% for furosemide using the instantaneous input principle.

    Conclusions:

    • The instantaneous input hypothesis may lead to significant deviations in early pharmacokinetic data, particularly for certain drugs.
    • Cautious interpretation of venous pharmacokinetic data derived from this hypothesis is warranted.
    • Further research in both animals and humans is necessary to determine the generalizability of these findings.