Pharmacokinetics of ticarcillin in the horse after intravenous and intramuscular administration.

The research article investigates how ticarcillin, an antibiotic, behaves in horses’ bodies when administered intravenously and intramuscularly. The study found the quantity of the drug that stayed in the horses’ blood and abdominal fluid over time and revealed the half-life and bioavailability of the drug when administered in these two ways.

Research Methodology and Findings

The study was carried out using ten healthy, adult horses. The researchers administered a measured dose of 44mg/kg of the horses’ body weight. This dosage was given both through an intravenous (IV) injection and an intramuscular (IM) injection, and the horses’ blood and abdominal fluid samples were studied over a course of 8 hours.

Here is what the results showed:

• After the IV injection, the concentration of ticarcillin in the horses’ blood serum was around 104.3 mg/L approximately half an hour post-injection.
• The concentration in the peritoneal (abdominal) fluid reached its maximum mean peak 2 hours after the IV injection at approximately 61.4mg/L.
• On the other hand, following the IM injection, the maximum concentrations of ticarcillin in the blood serum and peritoneal fluid occurred 2 hours post-injection at around an average of 28.3 mg/L and 19.2 mg/L respectively.
• Ticarcillin persisted in the blood serum and peritoneal fluid for a longer time after the IM – 8 hours compared to 6 hours after the IV injection.
• The half-life of ticarcillin after being injected intravenously was approximately 0.94 hour.
• The drug’s bioavailability, or the proportion of the drug that entered the horses’ system and was able to have an active effect, was about 64.9% when administered IM.

Implications of the Research

The findings of the research are critical to inform dosage and route of administration for prescribing ticarcillin to horses. As per the study, it might be more beneficial to administer the drug via IM injection to ensure a longer presence in the horse’s system. However, the concentration of the drug is found to be higher post IV injections, which can be potentially critical according to the condition being treated. It’s noteworthy that the bioavailability of ticarcillin when administered IM was 64.9%, indicating a considerable amount of the antibiotic successfully enters the horse’s system and can yield a therapeutic effect. This knowledge is vital in optimizing pharmacotherapy in equine practice.