Safety of fluralaner, a novel systemic antiparasitic drug, in MDR1(-/-) Collies after oral administration

Background: Fluralaner is a novel systemic ectoparasiticide for dogs providing long-acting flea-and tick-control after a single oral dose. This study investigated the safety of oral administration of fluralaner at 3 times the highest expected clinical dose to Multi Drug Resistance Protein 1 (MDR1(-/-)) gene defect Collies. Methods: Sixteen Collies homozygous for the MDR1 deletion mutation were included in the study. Eight Collies received fluralaner chewable tablets once at a dose of 168 mg/kg; eight sham dosed Collies served as controls. All Collies were clinically observed until 28 days following treatment. Results: No adverse events were observed subsequent to fluralaner treatment of MDR1(-/-) Collies at three times the highest expected clinical dose. Conclusions: Fluralaner chewable tablets are well tolerated in MDR1(-/-) Collies following oral administration.