Didn't work as expected after Fenbendazole in horses

The FDA has received 27 reports of didn't work as expected in horses after Fenbendazole. That is 16% of all reports for this medicine, compared with 23% across reports for all horse medicines.

27Reports

37%Marked serious

11%Recovered

7.4%Died or euthanised

–Typical onset

How the animals did

Recovered

3 11%

Still unwell when reported

10 37%

Died

1 3.7%

Euthanised

1 3.7%

Not known

12 44%

Problems reported at the same time

Didn't stop worms

2 7.4%

Death

1 3.7%

Abdominal pain

1 3.7%

Behaviour change

1 3.7%

Pacing

1 3.7%

Pr-small intestine, lesion(s)

1 3.7%

Ulceration

1 3.7%

Intussusception

1 3.7%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Fenbendazole treats intestinal worms and some other parasites.

Questions owners ask

Can Fenbendazole cause didn't work as expected in horses?: 27 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).

Didn't work as expected with similar medicines

Didn't work as expected after Pyrantel 263 reports · 28% of its reports

All reported side effects of Fenbendazole in horses · Medicines most reported with didn't work as expected