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Assessment of the speed of flea kill of lotilaner (Credelio™) throughout the month following oral administration to dogs
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Assessment of the speed of flea kill of lotilaner (Credelio™) throughout the month following oral administration to dogs
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Journal Article
Assessment of the speed of flea kill of lotilaner (Credelio™) throughout the month following oral administration to dogs
2017
Overview
Background
Lotilaner (Credelio™, Elanco), a novel isoxazoline, is a systemic insecticide and acaricide that is rapidly absorbed following oral administration to dogs and has a half-life of 30 days. As part of a development program, studies were undertaken to investigate lotilaner’s initial and sustained efficacy and speed of kill against fleas.
Methods
Four studies were conducted to evaluate the onset of lotilaner’s speed of flea knockdown at the time of treatment, and to determine the sustained speed of flea kill (SOK) up to 35 days post-treatment. Each study assessed one or two specific time points (4, 6, 8 and 12 h) post-treatment and following weekly re-infestations. In each study, dogs were randomised to a lotilaner or an untreated group based on pre-administration flea counts, and before treatment were infested with adult
Ctenocephalides felis
. Dogs randomised to a lotilaner group received a single treatment on Day 0, at the minimum recommended dose rate of 20 mg/kg, 30 (± 5) minutes after being fed. Efficacy was calculated using geometric, and arithmetic mean flea counts in treated versus untreated groups.
Results
On Day 0, lotilaner efficacy was 89.9% at 4 h, 99.2% at 6 h, 99.9% at 8 h, and 100% at 12 h post-treatment. At each weekly assessment, lotilaner efficacy at 4 h remained at > 97%, at 8 h remained at > 99%, and at 12 h remained at 100% through Day 35. Across all studies, there were no treatment-related adverse events.
Conclusion
Lotilaner’s rapid flea knockdown immediately following treatment and sustained SOK through 35 days post-treatment offers a new solution for helping to eliminate the health risks that accompany flea infestations on dogs. The consistency of the rapid, sustained flea SOK demonstrated in these studies generates confidence that monthly use of lotilaner in dogs can be valuable in disrupting the flea life cycle in a contaminated environment, and that newly acquired fleas will die quickly, thereby reducing the discomfort of flea bites. The sustained lotilaner SOK also provides confidence that there will be no “end-of-dose” resurgence in flea burdens with the potential accompanying consequence of flares in flea-bite hypersensitivity.
Publisher
BioMed Central,BioMed Central Ltd,Springer Nature B.V,BMC
Subject
/ adults
/ Animals
/ Biomedical and Life Sciences
/ Control
/ Credelio
/ Ctenocephalides - drug effects
/ Dog
/ Dogs
/ Dosage
/ Female
/ Flea Infestations - drug therapy
/ Flea Infestations - veterinary
/ Fleas
/ Insecticides - administration & dosage
/ Insecticides - therapeutic use
/ Male
/ Studies
/ Testing
/ Veterinary Medicine/Veterinary Science
/ Virology
