Nasal discharge after Fenbendazole in dogs

The FDA has received 24 reports of nasal discharge in dogs after Fenbendazole. That is 0.4% of all reports for this medicine, compared with 0.1% across reports for all dog medicines, so it is reported unusually often with this medicine.

24Reports

58%Marked serious

4.2%Recovered

38%Died or euthanised

7 daysTypical onset

How soon it started

Same day

3 20%

1–2 days

1 6.7%

3–7 days

4 27%

1–4 weeks

5 33%

Over a month

2 13%

How the animals did

Recovered

1 4.2%

Still unwell when reported

9 38%

Died

3 13%

Euthanised

6 25%

Not known

5 21%

Problems reported at the same time

9 38%

8 33%

7 29%

7 29%

6 25%

Didn't work as expected

6 25%

Tremors

5 21%

Cough

4 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 nasal discharge in dogs?: 24 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).

Nasal discharge with similar medicines

Nasal discharge after Pyrantel + Sarolaner (Simparica Trio) 32 reports · 0.1% of its reports
Nasal discharge after Pyrantel 25 reports · 0.5% of its reports

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