Breathing problems after Fenbendazole in dogs

142 reports to the FDA describe breathing problems in dogs given Fenbendazole. That is 2.4% of all reports for this medicine, compared with 2.7% across reports for all dog medicines.

142Reports

60%Marked serious

21%Recovered

32%Died or euthanised

1 daysTypical onset

How soon it started

Same day

37 40%

1–2 days

18 19%

3–7 days

16 17%

1–4 weeks

14 15%

Over a month

8 8.6%

How the animals did

Recovered

30 21%

Still unwell when reported

36 25%

Died

27 19%

Euthanised

18 13%

Not known

31 22%

Problems reported at the same time

59 42%

49 35%

44 31%

37 26%

26 18%

19 13%

18 13%

16 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 breathing problems in dogs?: 142 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).

Breathing problems with similar medicines

Breathing problems after Pyrantel + Sarolaner (Simparica Trio) 762 reports · 1.4% of its reports
Breathing problems after Febantel + Praziquantel + Pyrantel (Drontal Plus) 126 reports · 1.9% of its reports
Breathing problems after Pyrantel 221 reports · 4.6% of its reports
Breathing problems after Praziquantel + Pyrantel 175 reports · 4.7% of its reports
Breathing problems after Praziquantel 21 reports · 1.9% of its reports

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