Intentional misuse after Fenbendazole in dogs

The FDA has received 23 reports of intentional misuse in dogs after Fenbendazole. That is 0.4% of all reports for this medicine, compared with 0.4% across reports for all dog medicines.

23Reports

65%Marked serious

30%Recovered

0.0%Died or euthanised

2 daysTypical onset

How soon it started

Same day

6 32%

1–2 days

4 21%

3–7 days

0 0.0%

1–4 weeks

3 16%

Over a month

6 32%

How the animals did

Recovered

6 26%

Recovered with lasting effects

1 4.3%

Still unwell when reported

14 61%

Not known

2 8.7%

Problems reported at the same time

Didn't stop worms

9 39%

Loss of appetite

6 26%

Diarrhea

5 22%

Odor, abnormal

5 22%

Suspect counterfeit product

5 22%

Restlessness or agitation

5 22%

Didn't work as expected

4 17%

Behaviour change

4 17%

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 intentional misuse in dogs?: 23 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.
How soon after a dose was it reported?: In half of the reports with dates, it started within 2 days of the first dose.
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).

Intentional misuse with similar medicines

Intentional misuse after Pyrantel + Sarolaner (Simparica Trio) 1,951 reports · 3.7% of its reports

All reported side effects of Fenbendazole in dogs · Medicines most reported with intentional misuse