Pharmacokinetics, efficacy, and adverse effects of selamectin following topical administration in flea-infested rabbits.

To determine pharmacokinetics, efficacy, and adverse effects of topically administered selamectin in flea-infested rabbits.
18 healthy 5-month-old New Zealand White rabbits.
On day 0, rabbits (n = 6/group) received topically applied selamectin at doses of 10 or 20 mg/kg or received no treatment. Each rabbit was infested with 50 fleas (Ctenocephalides felis) on days -1, 7, and 14. Live and dead flea counts were performed on days 2, 9, and 16, and treatment efficacy was calculated. Blood samples were collected prior to drug administration and at 6 and 12 hours and 1, 2, 3, 5, 7, 10, 14, 21, and 28 days after treatment for determination of plasma selamectin concentrations via high-performance liquid chromatography with mass spectrometry. Pharmacokinetic parameters were determined.
On day 2, efficacy of selamectin against flea populations of rabbits in the 10 and 20 mg/kg treatment groups was 91.3% and 97.1%, respectively, but by day 9, these values decreased to 37.7% and 74.2%, respectively. Mean terminal half-life and maximum plasma concentrations of selamectin were 0.93 days and 91.7 ng/mL, respectively, for rabbits in the 10 mg/kg group and 0.97 days and 304.2 ng/mL, respectively, for rabbits in the 20 mg/kg group. No adverse effects were detected.
Selamectin was rapidly absorbed transdermally and was rapidly eliminated in rabbits. Results suggested that topical administration at a dosage of 20 mg/kg every 7 days is efficacious for treatment of flea infestation in rabbits. Further studies are needed to assess long-term safety in rabbits following repeated applications.
AuthorsJames W Carpenter, Michael W Dryden, Butch Kukanich
JournalAmerican journal of veterinary research (Am J Vet Res) Vol. 73 Issue 4 Pg. 562-6 (Apr 2012) ISSN: 1943-5681 [Electronic] United States
PMID22452505 (Publication Type: Clinical Trial, Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Antiparasitic Agents
  • Ivermectin
  • selamectin
  • Administration, Topical
  • Animals
  • Antiparasitic Agents (administration & dosage, blood, pharmacokinetics, therapeutic use)
  • Area Under Curve
  • Ectoparasitic Infestations (drug therapy, veterinary)
  • Female
  • Half-Life
  • Ivermectin (administration & dosage, analogs & derivatives, blood, pharmacokinetics, therapeutic use)
  • Male
  • Rabbits
  • Siphonaptera

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