Ivermectin toxicosis in three adult horses.
METHODS
3 adult Quarter Horses were evaluated for acute, progressive neurologic signs 18 hours after oral administration of 1 dose of 1.87% ivermectin paste.


RESULTS
Clinical signs included depression, forelimb and hind limb ataxia, drooping of the superior and inferior lips, and muscle fasciculations. Bilateral mydriasis, decreased pupillary light reflexes, and absent menace reflexes were evident. Clinical signs progressed in severity for 36 hours after administration of the ivermectin.


RESULTS
All horses were treated supportively with IV administration of fluids and anti-inflammatory medications. Two horses survived with no apparent long-term sequelae. One horse was euthanized, and a high concentration of ivermectin was detected in its brain tissue at postmortem examination. Analysis of the ivermectin concentration in the paste product revealed that the concentration was approximately that indicated on the packaging.


CONCLUSIONS
Ivermectin toxicosis is an uncommonly reported condition in equids that should be considered when acute neurologic impairment develops after ivermectin administration. Recovery is possible with supportive care and time.
Swor
Tamara M
TM
Department of Large Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA.
Whittenburg
Jamie L
JL
Chaffin
M Keith
MK
D000818:Animals; D000871:Anthelmintics / Q000009:adverse effects*; D005260:Female; D005440:Fluid Therapy / Q000662:veterinary; D006734:Horse Diseases / Q000139:chemically induced*; D006736:Horses; D007559:Ivermectin / Q000009:adverse effects*; D008297:Male
D000871:Anthelmintics; D007559:Ivermectin