Pharmacokinetics of a single intravenous dose of marbofloxacin in adult donkeys.

The research study conducted an investigation into the pharmacokinetics of a single intravenous dose of marbofloxacin in adult donkeys, determining key parameters and predicting efficacy against certain pathogens. The study found unique characteristics of marbofloxacin in donkeys and suggests potential doses for clinical trials targeting specific infections.

Pharmacokinetic Study

• This research examined the pharmacokinetics (the movement of drugs within the body) of a one-time intravenous dose of a drug called marbofloxacin in adult donkeys.
• Six donkeys each received 2 mg/kg of marbofloxacin, delivered in a 10 per cent aqueous solution.

Pharmacokinetic Parameters

• The study looked at key pharmacokinetic parameters, including volume of distribution, elimination half-life and total body clearance.
• Marbofloxacin’s pharmacokinetics in donkeys was characterised by a large mean volume of distribution on a steady state (1.15 [0.09] L/kg) and a long average elimination half-life of 9.24 hours (with a standard deviation of 1.96 hours).
• Marbofloxacin also showed a somewhat slow total body clearance of 0.10 (0.02) l/kg/hour, slower than what is observed in horses.

Predicting Efficacy

• The researchers computed two efficacy indices, using the determined pharmacokinetic parameters and selected values of marbofloxacin’s minimum inhibitory concentration (MIC90 – concentration of the drug needed to inhibit bacterial growth by 90%) against harmful equine strains.
• This was done in order to predict how effective the drug would be at the administered dose. The study found that the efficacy predictions were appropriate only for pathogens from the Enterobacteriaceae family.

Recommendations for Clinical Trials

• Based on the findings, the researchers proposed potential doses for clinical trials aiming to treat infections caused by Enterobacteriaceae, Staphylococcus aureus, and Streptococci.
• The recommended daily intravenous doses were 0.33 mg/kg for Enterobacteriaceae, 2.62 mg/kg for Staphylococcus aureus, and 20 mg/kg for Streptococci.