Pacing after Fenbendazole in dogs

The FDA has received 28 reports of pacing in dogs after Fenbendazole. That is 0.5% of all reports for this medicine, compared with 0.3% across reports for all dog medicines.

28Reports

39%Marked serious

29%Recovered

14%Died or euthanised

1 daysTypical onset

How soon it started

Same day

8 50%

1–2 days

5 31%

3–7 days

0 0.0%

1–4 weeks

1 6.3%

Over a month

2 13%

How the animals did

Recovered

8 29%

Still unwell when reported

5 18%

Died

2 7.1%

Euthanised

2 7.1%

Not known

11 39%

Problems reported at the same time

Restlessness or agitation

17 61%

11 39%

8 29%

5 18%

5 18%

5 18%

4 14%

4 14%

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 pacing in dogs?: 28 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 1 day 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).

Pacing with similar medicines

Pacing after Pyrantel + Sarolaner (Simparica Trio) 138 reports · 0.3% of its reports
Pacing after Febantel + Praziquantel + Pyrantel (Drontal Plus) 75 reports · 1.1% of its reports

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