Plasma and peritoneal fluid concentrations of ceftriaxone after intravenous and intraperitoneal administration in horses.

The research paper explores the effects of intraperitoneal (IP) and intravenous (IV) administration of ceftriaxone, an antibiotic, in horses. The study suggests that IP administration may provide more effective results in managing peritonitis in horses than the traditional IV method.

Research Objective

• The purpose of this research was to compare plasma and peritoneal fluid concentrations of ceftriaxone after administration through IP and IV routes in horses.
• Another goal was to identify any adverse effects related to the administration of this medication.

Methodology

• The study involved ten horses, divided equally into two groups.
• One group received the antibiotic via IP catheter and the other received the drug through IV injection, both dosed at 25mg/kg and diluted in saline solution.
• Each treatment was administered once a day over five days.
• The researchers collected plasma and peritoneal fluid samples after the first and fifth treatments. The samples were then analyzed to determine ceftriaxone levels.

Results

• The study found that ceftriaxone concentrations remained above the minimum inhibitory concentration (MIC) – the least concentration that prevents bacterial growth – for longer periods following IP administration than following IV injection; 24 hours in peritoneal fluid and 12 hours in plasma for IP, while 12 hours in peritoneal fluid and 10 hours in plasma for IV.
• No negative effects were noted from either administration method throughout the five-day regimen.
• The IP method provided a greater availability of the drug in peritoneal fluid as compared to the IV method.

Conclusion

• Based on the results, it was observed that IP administration of ceftriaxone may be more beneficial for prophylaxis and/or treatment of peritonitis in horses.
• The reason being that the IP method enhances the availability of ceftriaxone in peritoneal fluid, where the bacteria causing peritonitis are likely found, making the treatment potentially more effective.