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Pharmacokinetics of minocycline and vancomycin in rabbits
D P Nicolau1, C D Freeman, C H Nightingale
1Department of Pharmacy, Hartford Hospital, CT 06115.
Abstract:
The pharmacokinetic disposition of minocycline and vancomycin was studied in New Zealand White rabbits before initiating an experimental staphylococcal endocarditis protocol. Minocycline was administered in a multiple-dose regimen of 3 mg/kg i.v. every 12 h, 3 mg/kg i.v. every 8 h, and 6 mg/kg i.v. every 8 h. Vancomycin was given in a similar fashion using regimens of 75 mg/kg i.v. every 12 h and 50 mg/kg i.v. every 8 h. Multiple serum samples were obtained after the fifth dose and drug concentrations were analyzed by microbiologic assay. The pharmacokinetic parameters for each of the drug regimens were calculated using a two-compartment model by nonlinear least-squares regression. No statistically significant differences were noted in the volume of distribution or the half-life of the individual dosing regimens for either agent. As a result of this study, it appears that a minocycline regimen of 6 mg/kg i.v. every 8 h and a vancomycin regimen of 50 mg/kg i.v. every 8 h are appropriate dosing schemes for a comparative study of these agents in rabbits.
Insights
This study determined optimal dosing for minocycline and vancomycin in rabbits. Regimens of 6 mg/kg i.v. every 8h for minocycline and 50 mg/kg i.v. every 8h for vancomycin are suitable for future research.
Area of Science:
- Pharmacokinetics and Drug Metabolism
- Infectious Diseases
- Veterinary Pharmacology
Background:
- Staphylococcal endocarditis is a serious infection requiring effective antibiotic treatment.
- Minocycline and vancomycin are key antibiotics used in treating bacterial infections.
- Establishing appropriate dosing regimens is crucial for preclinical research.
Purpose of the Study:
- To characterize the pharmacokinetic disposition of minocycline and vancomycin in New Zealand White rabbits.
- To identify suitable intravenous dosing schemes for minocycline and vancomycin for future comparative studies.
- To inform the design of experimental staphylococcal endocarditis protocols.
Main Methods:
- Multiple intravenous dosing regimens of minocycline and vancomycin were administered to rabbits.
- Serum drug concentrations were measured by microbiologic assay after the fifth dose.
- Pharmacokinetic parameters were calculated using a two-compartment model and nonlinear regression analysis.
Main Results:
- No statistically significant differences in volume of distribution or half-life were observed across different dosing regimens for either minocycline or vancomycin.
- The study identified specific dosing regimens as appropriate for further investigation.
- Pharmacokinetic parameters were successfully determined for both agents under various dosing schedules.
Conclusions:
- A minocycline regimen of 6 mg/kg intravenously every 8 hours is appropriate.
- A vancomycin regimen of 50 mg/kg intravenously every 8 hours is appropriate.
- These selected dosing schemes provide a solid foundation for comparative pharmacokinetic studies in rabbits, particularly for staphylococcal endocarditis models.