Efficacy of orally administered fluralaner (Bravecto<sup>TM</sup>) or topically applied imidacloprid/moxidectin (Advocate®) against generalized demodicosis in dogs

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Abstract

Background: This laboratory study compared the efficacy of Bravecto ™ (fluralaner), formulated as a chewable tablet, with the efficacy of Advocate® (imidacloprid/moxidectin), formulated for topical administration, against naturally acquired generalized demodicosis in dogs. Methods: Sixteen dogs, all diagnosed with generalized demodectic mange, were randomly allocated to two equal groups. Bravecto ™ chewable tablets were administered once orally at a minimum dose of 25 mg fluralaner/kg body weight to one group of dogs, while the second group was treated topically on three occasions at 28-day intervals with Advocate® at a minimum dose of 10 mg imidacloprid/kg body weight and 2.5 mg moxidectin/kg body weight. Mites were counted in skin scrapings and demodectic lesions were evaluated on each dog before treatment and at 28-day intervals thereafter over a 12 week study period. Deep skin scrapings (∼4 cm<sup>2</sup>) were made from the same five sites on each dog at each subsequent examination. Results: After single oral administration of Bravecto™ chewable tablets, mite numbers in skin scrapings were reduced by 99.8% on Day 28 and by 100% on Days 56 and 84. Mite numbers in the dogs treated topically on three occasions at 28-day intervals with Advocate® were reduced by 98.0% on Day 28, by 96.5% on Day 56 and by 94.7% on Day 84. Statistically significantly (P∈≤0.05) fewer mites were found on Days 56 and 84 on the Bravecto ™ treated dogs compared to Advocate ® treated dogs. A marked decrease was observed in the occurrence of erythematous patches, crusts, casts and scales in the dogs treated with Bravecto ™ and in the occurrence of erythematous patches in the dogs treated with Advocate®. With the exception of one dog in each treated group, all dogs exhibited hair regrowth∈≥∈90% at the end of the study in comparison with their hair-coat at study start. Conclusions: Single oral administration of Bravecto ™ chewable tablets is highly effective against generalized demodicosis, with no mites detectable at 56 and 84 days following treatment. In comparison, Advocate®, administered three times at 28-day intervals, is also highly effective against generalized demodicosis, but most dogs still harboured mites at all assessment time points. Both treatments resulted in a marked reduction of skin lesions and increase of hair re-growth 12 weeks after the initial treatment.

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Fourie, J. J., Liebenberg, J. E., Horak, I. G., Taenzler, J., Heckeroth, A. R., & Frénais, R. (2015). Efficacy of orally administered fluralaner (BravectoTM) or topically applied imidacloprid/moxidectin (Advocate®) against generalized demodicosis in dogs. Parasites and Vectors, 8(1). https://doi.org/10.1186/s13071-015-0775-8

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