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Caffeine clearance in the horse

J Schumacher¹, J S Spano, R C Wilson

¹Department of Large Animal Surgery and Medicine, College of Veterinary Medicine, Auburn University, AL 36849-5522.

Veterinary Research Communications

|January 1, 1994

Summary

This study investigated caffeine pharmacokinetics in horses, finding a long elimination half-life of 10.18 hours. Caffeine dosage did not correlate with its elimination rate in equine subjects.

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Area of Science:

Veterinary Pharmacology
Equine Pharmacokinetics

Background:

Caffeine is a widely used stimulant with potential applications in veterinary medicine.
Understanding caffeine's pharmacokinetic profile in horses is crucial for safe and effective therapeutic use.

Purpose of the Study:

To characterize the pharmacokinetic properties of intravenously administered caffeine in horses.
To determine key parameters such as distribution half-life, elimination half-life, and volume of distribution.
To investigate the relationship between caffeine dosage and its elimination rate.

Main Methods:

Intravenous administration of caffeine to 10 horses.
Utilized a commercially available automated enzyme immunoassay for drug quantification.
Analyzed plasma samples to determine pharmacokinetic parameters.

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Main Results:

The harmonic mean for distribution half-life was 5.2 minutes.
The harmonic mean for elimination half-life was 10.18 hours (range 6.82-20.92 hours).
The harmonic mean for the volume of distribution was 0.32 L/kg.
No significant correlation was found between caffeine dose and elimination half-life (Spearman's rho = 0.19).

Conclusions:

Intravenously administered caffeine exhibits a relatively long elimination half-life in horses.
The dose of caffeine administered does not appear to influence its elimination rate in this species.
These findings provide essential data for potential clinical applications of caffeine in equine medicine.