Pharmacokinetics of cefoperazone in horses.

The research addresses the study of pharmacokinetics and bioavailability of cefoperazone, an antibiotic, administered in single doses intravenously and intramuscularly to horses. It evaluates how the drug is absorbed, distributed, metabolized, and eliminated from the body.

Study Methodology

• The study administers cefoperazone (CPZ), a type of antibiotic, in single doses of 30 mg/kg to horses. This was done both through intravenous (IV) and intramuscular (IM) methods.
• After IV administration, concentrations of the drug in serum (blood), urine, and synovial fluid (joint lubricant) were measured. After IM administration, the same was investigated in serum, synovial fluid, and spongy bone samples.

Study Findings

Intravenous Administration Results

• After IV administration, the antibiotic had a rapid distribution phase with a half-life (t1/2) of 4.22 +/- 2.73 minutes. This was followed by a slower elimination phase with a half-life of 0.77 +/- 0.19 hours.
• The apparent volume of distribution was calculated to be 0.68 +/- 0.10 L/kg, suggesting how extensively the drug is distributed within the body.
• The average (mean) peak concentration of the antibiotic in the synovial fluid was 5.76 +/- 0.74 micrograms/milliliter indicating the drug’s ability to penetrate into joint fluid after IV administration.

Intramuscular Administration Results

• In the case of IM administration, the bioavailability of the drug was 42.00 +/- 5.33%. Bioavailability refers to the fraction of an administered drug that reaches the systemic circulation.
• The half-life during absorption was 2.51 +/- 0.72 minutes, and the elimination half-life was 1.52 +/- 0.15 hours, reflecting the time taken for the drug concentration to reduce in the body after IM administration.
• The average peak concentrations of the drug at 2 hours after IM administration was 2.91 +/- 0.85 micrograms/milliliter in the synovial fluid and 5.56 +/- 0.70 micrograms/milliliter in the spongy bone. This indicates the drug’s penetration potential into joint fluid and bone tissue after IM administration.

This research gives insight into the metabolism of the antibiotic Cefoperazone in horses, considering different administration routes. It provides important data for its therapeutic application, considering that the doses, intervals, and routes of administration should be optimized to maintain effective drug concentrations without causing toxicity.