A safety trial with rafoxanide in sheep

Area of Science:

• Veterinary Pharmacology
• Animal Toxicology
• Sheep Health

Background:

• Rafoxanide is an anthelmintic used in livestock.
• Understanding its safety profile and potential toxicity is crucial for animal welfare.
• Establishing diagnostic methods for rafoxanide exposure is important.

Purpose of the Study:

• To evaluate the toxicological effects of rafoxanide in lambs.
• To determine safe dosage ranges and identify potential adverse reactions.
• To assess the utility of plasma-rafoxanide assays for diagnosis.

Main Methods:

• Oral administration of rafoxanide to six groups of lambs (6 lambs/group) at escalating doses (0-37.5 mg/kg).
• Post-mortem examinations conducted 27-31 days post-treatment.
• Clinical, ophthalmological, and pathological assessments performed.

Main Results:

• No clinical signs of toxicity were observed in any treatment group.
• No treatment-related ophthalmological or pathological changes were detected.
• Lambs tolerated rafoxanide well within the tested dosage range.

Conclusions:

• Rafoxanide exhibits a good safety margin in lambs at the tested dosages.
• Differential diagnoses and predisposing factors for potential toxicity warrant further investigation.
• Plasma-rafoxanide concentration assays are proposed as a valuable diagnostic tool for suspected toxicity.