Unresponsive after Fenbendazole in dogs

38 reports to the FDA describe unresponsive in dogs given Fenbendazole. That is 0.6% of all reports for this medicine, compared with 0.4% across reports for all dog medicines, so it is reported unusually often with this medicine.

38Reports

79%Marked serious

16%Recovered

58%Died or euthanised

Same dayTypical onset

How soon it started

Same day

14 56%

1–2 days

4 16%

3–7 days

1 4.0%

1–4 weeks

4 16%

Over a month

2 8.0%

How the animals did

Recovered

5 13%

Recovered with lasting effects

1 2.6%

Still unwell when reported

1 2.6%

Died

11 29%

Euthanised

11 29%

Not known

9 24%

Problems reported at the same time

22 58%

18 47%

13 34%

12 32%

10 26%

9 24%

9 24%

7 18%

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 unresponsive in dogs?: 38 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 the same 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).

Unresponsive with similar medicines

Unresponsive after Pyrantel + Sarolaner (Simparica Trio) 105 reports · 0.2% of its reports
Unresponsive after Pyrantel 36 reports · 0.8% of its reports

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