Pharmacokinetic–pharmacodynamic relationship of marbofloxacin for Escherichia coli and Pasturella multocida following repeated intramuscular administration in goats

Author:

Bhardwaj Pallavi12ORCID,Sidhu Pritam K.3ORCID,Saini Simrat Pal Singh1,M.B. Dinesh1,Rampal Satyavan1

Affiliation:

1. Department of Veterinary Pharmacology and Toxicology Guru Angad Dev Veterinary and Animal Sciences University Ludhiana India

2. Department of Veterinary Pharmacology and Toxicology, Dr. G.C. Negi College of Veterinary and Animal Sciences CSK H.P. Agricultural University Palampur India

3. College of Veterinary Medicine Kansas State University Manhattan Kansas

Abstract

AbstractThe pharmacokinetics (PK) and pharmacodynamics (PD) of marbofloxacin (MBF) were determined in six healthy female goats of age 1.00–1.25 years after repeated administration of MBF. The MBF was administered intramuscularly (IM) at 2 mg kg−1 day−1 for 5 days. Plasma concentrations of MBF were determined by high‐performance liquid chromatography, and PK parameters were obtained using noncompartmental analysis. The MBF concentrations peaked at 1 hr, and peak concentration (Cmax) was 1.760 µg/ml on day 1 and 1.817 µg/ml on day 5. Repeated dosing of MBF caused no significant change in PK parameters except area under curve (AUC) between day 1 (AUC0–∞D1 = 7.67 ± 0.719 µg × hr/ml) and day 5 (AUC0‐∞D5 = 8.70 ± 0.857 µg × hr/ml). A slight difference in mean residence time between 1st and 5th day of administration and accumulation index (AI = 1.13 ± 0.017) suggested lack of drug accumulation following repeated IM administration up to 5 days. Minimum inhibitory concentration (MIC) demonstrated that Escherichia coli (MIC = 0.04 µg/ml) and Pasturella multocida (MIC = 0.05 µg/ml) were highly sensitive to MBF. Time‐kill kinetics demonstrated rapid and concentration‐dependent activity of MBF against these pathogens. PK/PD integration of data for E. coli and P. multocida, using efficacy indices: Cmax/MIC and AUC0–24hr/MIC, suggested that IM administration of MBF at a dose of 2 mg kg−1 day−1 is appropriate to treat infections caused by E. coli. However, a dose of 5 mg kg−1 day−1 is recommended to treat pneumonia caused by P. multocida in goats. The study indicated that MBF can be used repeatedly at dosage of 2 mg/kg in goats without risk of drug accumulation up to 5 days.

Publisher

Wiley

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