Pharmacokinetics of digoxin in cattle

Area of Science:

• Pharmacokinetics and pharmacodynamics
• Veterinary medicine
• Animal physiology

Background:

• Digoxin is a cardiac glycoside used to treat heart conditions.
• Understanding digoxin's pharmacokinetics in cattle is crucial for effective treatment.
• Previous studies on digoxin in cattle are limited.

Purpose of the Study:

• To determine the pharmacokinetic profile of digoxin in cattle.
• To establish optimal intravenous dosage regimens for digoxin in cattle.
• To compare digoxin's half-life in cattle to other animal species.

Main Methods:

• Single intravenous injection of digoxin (22 µg/kg) in six cattle.
• Serum digoxin concentrations were measured over time.
• Pharmacokinetic analysis using bi- and tri-exponential equations.
• Computer simulations for dosage regimen optimization.

Main Results:

• The tri-exponential equation best described digoxin serum concentrations in most cattle.
• The biological half-life of digoxin in cattle was determined to be 7.8 hours.
• Simulations indicated a loading dose of 22 µg/kg followed by a 0.86 µg/kg/h infusion for optimal safety and efficacy.

Conclusions:

• Digoxin exhibits a relatively short half-life in cattle compared to other species.
• Frequent administration or continuous infusion is necessary to maintain therapeutic digoxin concentrations in cattle.
• A specific intravenous dosage regimen is proposed for safe and effective digoxin use in bovine patients.