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Plasma clearance.

P L Toutain1, A Bousquet-Mélou

  • 1UMR 181 Physiopathologie et Toxicologie Expérimentales INRA/ENVT, Ecole Nationale Vétérinaire de Toulouse, Toulouse cedex 03, France. pl.toutain@envt.fr

Journal of Veterinary Pharmacology and Therapeutics
|December 17, 2004
PubMed
Summary
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Plasma clearance, a key pharmacokinetic parameter, reflects the body's drug elimination efficiency. It is crucial for determining drug dosage and overall exposure levels.

Area of Science:

  • Pharmacokinetics
  • Drug Metabolism
  • Physiology

Background:

  • Plasma clearance quantifies drug elimination by organs like the liver and kidneys.
  • It represents the body's overall efficiency in removing a substance.
  • Understanding clearance is vital for effective drug therapy.

Purpose of the Study:

  • To define plasma clearance and its determinants.
  • To explain its significance in pharmacokinetics.
  • To highlight its role in drug dosing and exposure.

Main Methods:

  • Defining plasma clearance as a volume per unit time.
  • Relating clearance to drug elimination rate and plasma concentration.
  • Introducing the body extraction ratio for interpretation.

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Main Results:

  • Plasma clearance integrates individual organ clearances (liver, kidney).
  • It is calculated as elimination rate divided by plasma concentration.
  • The body extraction ratio aids in understanding drug removal.

Conclusions:

  • Plasma clearance is the most critical pharmacokinetic parameter.
  • It directly influences overall drug exposure and bioavailability.
  • It enables the calculation of required dosages for steady-state concentrations.