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Published on: July 11, 2014
Using deconvolution to understand the mechanism for variable plasma concentration-time profiles after intramuscular
Adnan H Mahmood1, Xin Liu2, Jeffrey E Grice2
1Therapeutics Research Centre, UQ School of Medicine, Translational Research Institute, 37 Kent St., Woolloongabba, Qld 4102, Australia; The Technical Institute of Baqubah, Foundation of Technical Education, Iraq.
Marbofloxacin (MBX) and trovafloxacin (TVX) pharmacokinetics in sheep revealed MBX follows first-order absorption, while TVX exhibits zero-order absorption due to injection site precipitation.
Area of Science:
- Veterinary Pharmacology
- Pharmacokinetics
- Antibiotic Development
Background:
- Antibiotic resistance necessitates new treatments for sheep infectious diseases.
- Expanding veterinary antibiotic options is crucial for animal health.
- Understanding drug absorption is key to effective antibiotic therapy.
Purpose of the Study:
- To compare the pharmacokinetics of marbofloxacin (MBX) and trovafloxacin (TVX) in sheep.
- To elucidate the absorption mechanisms of MBX and TVX after intramuscular injection.
- To identify factors influencing variable drug plasma concentrations.
Main Methods:
- Intramuscular and intravenous pharmacokinetic studies in sheep.
- Population pharmacokinetic analysis.
- Deconvolution methods (Loo-Riegelman, staircase, Spath-spline, B-spline) to determine absorption profiles.
- Reflectance confocal microscopy to examine injection site deposits.
Main Results:
- Marbofloxacin (MBX) showed predictable plasma concentration-time profiles.
- Trovafloxacin (TVX) exhibited variable and irregular plasma concentrations.
- Deconvolution indicated MBX follows first-order absorption, while TVX follows zero-order absorption.
- Precipitation of TVX at the injection site was identified as the cause of zero-order absorption.
Conclusions:
- MBX demonstrates reliable absorption characteristics for sheep treatment.
- TVX's zero-order absorption, linked to precipitation, may impact its therapeutic efficacy.
- Further research into formulation or administration of TVX could optimize its use in sheep.
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