Wobbliness (ataxia) after Fenbendazole in dogs

161 reports to the FDA describe wobbliness (ataxia) in dogs given Fenbendazole. That is 2.7% of all reports for this medicine, compared with 2.6% across reports for all dog medicines.

161Reports

45%Marked serious

23%Recovered

12%Died or euthanised

1 daysTypical onset

How soon it started

Same day

38 44%

1–2 days

28 32%

3–7 days

5 5.7%

1–4 weeks

6 6.9%

Over a month

10 11%

How the animals did

Recovered

36 22%

Recovered with lasting effects

1 0.6%

Still unwell when reported

36 22%

Died

13 8.1%

Euthanised

7 4.3%

Not known

68 42%

Problems reported at the same time

65 40%

42 26%

36 22%

29 18%

26 16%

24 15%

18 11%

Eye or vision problems

17 11%

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 wobbliness (ataxia) in dogs?: 161 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).

Wobbliness (ataxia) with similar medicines

Wobbliness (ataxia) after Pyrantel + Sarolaner (Simparica Trio) 1,115 reports · 2.1% of its reports
Wobbliness (ataxia) after Febantel + Praziquantel + Pyrantel (Drontal Plus) 95 reports · 1.4% of its reports
Wobbliness (ataxia) after Pyrantel 163 reports · 3.4% of its reports
Wobbliness (ataxia) after Praziquantel + Pyrantel 112 reports · 3.0% of its reports
Wobbliness (ataxia) after Praziquantel 35 reports · 3.2% of its reports

All reported side effects of Fenbendazole in dogs · Medicines most reported with wobbliness (ataxia)