Ivermectin (Heartgard) side effects in Quarter Horses

171 FDA reports involve Ivermectin in a Quarter Horse. These are the problems they describe.

Death
42 25%
Abdominal pain
31 18%
Wobbliness (ataxia)
28 16%
Lethargy
27 16%
Recumbency
23 13%
Didn't work as expected
16 9.4%
Swelling
15 8.8%
Loss of appetite
14 8.2%
Itching
11 6.4%
Allergic reaction
11 6.4%
Didn't stop worms
10 5.8%
No sign
9 5.3%

All reports for Ivermectin in horses