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Antimicrobial tissue concentrations.

Ping Liu1, Hartmut Derendorf

  • 1Department of Pharmaceutics, College of Pharmacy, University of Florida, 1600 SW Archer Road, PO Box 100494, Gainesville, FL 32610, USA.

Infectious Disease Clinics of North America
|January 9, 2004
PubMed
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Free antibiotic concentrations in tissue, not plasma, determine treatment success. Measuring unbound tissue levels via microdialysis provides accurate PK-PD analysis for optimal dosing, improving patient outcomes and reducing resistance.

Area of Science:

  • Pharmacokinetics and Pharmacodynamics
  • Anti-infective Therapy
  • Clinical Microbiology

Background:

  • Antibiotic efficacy depends on pharmacokinetic (PK) and pharmacodynamic (PD) properties.
  • Therapeutic effect relies on free antibiotic concentrations at the infection site, often lower than plasma levels.

Purpose of the Study:

  • To highlight the importance of free tissue antibiotic concentrations for PK-PD analysis.
  • To advocate for direct measurement of unbound tissue concentrations for accurate efficacy assessment.

Main Methods:

  • Utilizing microdialysis to directly measure unbound antibiotic concentrations in target tissues.
  • Comparing tissue-bound versus plasma concentrations in PK-PD modeling.

Main Results:

Related Experiment Videos

  • Plasma concentrations overestimate antibiotic levels at the site of action.
  • Free tissue concentrations are more appropriate PK inputs for PK-PD analysis.

Conclusions:

  • Direct measurement of unbound tissue antibiotic concentrations is crucial for accurate PK-PD analysis.
  • Optimizing antibiotic dosing based on tissue concentrations improves patient outcomes, reduces costs, and mitigates resistance development.