Ivermectin + Pyrantel (Heartgard Plus) side effects in Collies

318 FDA reports involve Ivermectin + Pyrantel in a Collie. These are the problems they describe.

Didn't prevent heartworm
90 28%
Didn't work as expected
51 16%
Vomiting
49 15%
Didn't stop worms
42 13%
Diarrhea
33 10%
Seizures
29 9.1%
Lethargy
25 7.9%
Digestive tract disorder
24 7.5%
Death
15 4.7%
Wobbliness (ataxia)
14 4.4%
Loss of appetite
13 4.1%
Cardiac disorder
13 4.1%

All reports for Ivermectin + Pyrantel in dogs