Diarrhea after Ivermectin (Heartgard) in horses
The FDA has received 52 reports of diarrhea in horses after Ivermectin. That is 7.5% of all reports for this medicine, compared with 4.9% across reports for all horse medicines, so it is reported unusually often with this medicine.
52Reports
13%Marked serious
15%Recovered
25%Died or euthanised
–Typical onset
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How the animals did
Problems reported at the same time
Age of the animals
About this medicine
Ivermectin prevents heartworm disease (monthly).
Products with this ingredient include Heartgard. The FDA hides brand names in its public data, so these reports cover every product with the same active ingredients.
Some herding breeds (for example Collies) carry the MDR1 gene variant and can be more sensitive to this drug class at high doses.
Questions owners ask
- Can Ivermectin cause diarrhea in horses?
- 52 reports link the two, but a report alone does not prove the medicine was the cause: other illnesses, other medicines or coincidence can be involved. Your vet can judge it for your animal.
- What should I do?
- Don't give another dose until you've spoken to your vet, and keep the packaging so you can tell them the product and dose. Your vet can also report it to the FDA (or you can, through the manufacturer or FDA form 1932a).
Diarrhea with similar medicines
- Diarrhea after Ivermectin + Praziquantel 122 reports · 4.6% of its reports
- Diarrhea after Moxidectin (ProHeart 6) 76 reports · 5.6% of its reports
- Diarrhea after Moxidectin + Praziquantel 37 reports · 9.9% of its reports
All reported side effects of Ivermectin in horses · Medicines most reported with diarrhea