Diarrhea after Pyrantel in horses

The FDA has received 56 reports of diarrhea in horses after Pyrantel. That is 6.0% of all reports for this medicine, compared with 4.9% across reports for all horse medicines.

56Reports

1.8%Marked serious

1.8%Recovered

8.9%Died or euthanised

–Typical onset

How the animals did

Recovered

1 1.8%

Died

5 8.9%

Not known

50 89%

Problems reported at the same time

Abdominal pain

12 21%

Didn't work as expected

9 16%

8 14%

5 8.9%

5 8.9%

3 5.4%

3 5.4%

Gut sounds increased

2 3.6%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Pyrantel treats roundworms and hookworms.

Questions owners ask

Can Pyrantel cause diarrhea in horses?: 56 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).

All reported side effects of Pyrantel in horses · Medicines most reported with diarrhea