Itching after Fenbendazole in dogs

The FDA has received 125 reports of itching in dogs after Fenbendazole. That is 2.1% of all reports for this medicine, compared with 4.3% across reports for all dog medicines, so it is reported less often than average with this medicine.

125Reports

44%Marked serious

20%Recovered

7.2%Died or euthanised

4 daysTypical onset

How soon it started

Same day

25 34%

1–2 days

10 14%

3–7 days

8 11%

1–4 weeks

12 16%

Over a month

18 25%

How the animals did

Recovered

25 20%

Still unwell when reported

41 33%

Died

3 2.4%

Euthanised

6 4.8%

Not known

50 40%

Problems reported at the same time

Vomiting

26 21%

Restlessness or agitation

20 16%

19 15%

18 14%

17 14%

15 12%

14 11%

14 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 itching in dogs?: 125 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 4 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).

Itching with similar medicines

Itching after Pyrantel + Sarolaner (Simparica Trio) 1,535 reports · 2.9% of its reports
Itching after Febantel + Praziquantel + Pyrantel (Drontal Plus) 157 reports · 2.3% of its reports
Itching after Pyrantel 157 reports · 3.3% of its reports
Itching after Praziquantel + Pyrantel 81 reports · 2.2% of its reports
Itching after Praziquantel 38 reports · 3.4% of its reports

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