Pain after Fenbendazole in dogs

The FDA has received 52 reports of pain in dogs after Fenbendazole. That is 0.9% of all reports for this medicine, compared with 0.7% across reports for all dog medicines.

52Reports

54%Marked serious

15%Recovered

9.6%Died or euthanised

12 daysTypical onset

How soon it started

Same day

6 22%

1–2 days

2 7.4%

3–7 days

1 3.7%

1–4 weeks

9 33%

Over a month

9 33%

How the animals did

Recovered

8 15%

Still unwell when reported

14 27%

Died

3 5.8%

Euthanised

2 3.8%

Not known

25 48%

Problems reported at the same time

21 40%

14 27%

13 25%

13 25%

10 19%

9 17%

8 15%

7 13%

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 pain in dogs?: 52 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 12 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).

Pain with similar medicines

Pain after Pyrantel + Sarolaner (Simparica Trio) 148 reports · 0.3% of its reports
Pain after Febantel + Praziquantel + Pyrantel (Drontal Plus) 32 reports · 0.5% of its reports
Pain after Pyrantel 62 reports · 1.3% of its reports
Pain after Praziquantel + Pyrantel 25 reports · 0.7% of its reports

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