Fever after Fenbendazole in dogs

144 reports to the FDA describe fever in dogs given Fenbendazole. That is 2.4% of all reports for this medicine, compared with 1.4% across reports for all dog medicines, so it is reported unusually often with this medicine.

144Reports

63%Marked serious

17%Recovered

17%Died or euthanised

7 daysTypical onset

How soon it started

Same day

17 19%

1–2 days

15 17%

3–7 days

13 15%

1–4 weeks

34 38%

Over a month

10 11%

How the animals did

Recovered

25 17%

Still unwell when reported

50 35%

Died

12 8.3%

Euthanised

13 9.0%

Not known

44 31%

Problems reported at the same time

94 65%

78 54%

41 28%

38 26%

37 26%

33 23%

30 21%

25 17%

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 fever in dogs?: 144 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 7 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).

Fever with similar medicines

Fever after Pyrantel + Sarolaner (Simparica Trio) 318 reports · 0.6% of its reports
Fever after Febantel + Praziquantel + Pyrantel (Drontal Plus) 48 reports · 0.7% of its reports
Fever after Pyrantel 108 reports · 2.3% of its reports
Fever after Praziquantel + Pyrantel 29 reports · 0.8% of its reports

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