Allergic reaction after Fenbendazole in dogs

95 reports to the FDA describe allergic reaction in dogs given Fenbendazole. That is 1.6% of all reports for this medicine, compared with 2.3% across reports for all dog medicines.

95Reports

40%Marked serious

21%Recovered

7.4%Died or euthanised

1 daysTypical onset

How soon it started

Same day

18 39%

1–2 days

10 22%

3–7 days

6 13%

1–4 weeks

10 22%

Over a month

2 4.3%

How the animals did

Recovered

20 21%

Still unwell when reported

25 26%

Died

6 6.3%

Euthanised

1 1.1%

Not known

43 45%

Problems reported at the same time

42 44%

21 22%

18 19%

17 18%

14 15%

11 12%

8 8.4%

7 7.4%

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 allergic reaction in dogs?: 95 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).

Allergic reaction with similar medicines

Allergic reaction after Pyrantel + Sarolaner (Simparica Trio) 569 reports · 1.1% of its reports
Allergic reaction after Febantel + Praziquantel + Pyrantel (Drontal Plus) 58 reports · 0.9% of its reports
Allergic reaction after Pyrantel 351 reports · 7.3% of its reports
Allergic reaction after Praziquantel + Pyrantel 55 reports · 1.5% of its reports

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