Death after Fenbendazole in dogs

The FDA has received 512 reports of death in dogs after Fenbendazole. That is 8.7% of all reports for this medicine, compared with 5.2% across reports for all dog medicines, so it is reported unusually often with this medicine.

512Reports

57%Marked serious

0.0%Recovered

99%Died or euthanised

3 daysTypical onset

How soon it started

Same day

47 20%

1–2 days

69 29%

3–7 days

36 15%

1–4 weeks

56 24%

Over a month

29 12%

How the animals did

Still unwell when reported

1 0.2%

Died

407 79%

Euthanised

101 20%

Not known

3 0.6%

Problems reported at the same time

190 37%

164 32%

163 32%

124 24%

49 9.6%

44 8.6%

Didn't work as expected

44 8.6%

Liver problems

40 7.8%

Age of the animals

Under 1 year

297

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 death in dogs?: 512 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 3 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).

Death with similar medicines

Death after Pyrantel + Sarolaner (Simparica Trio) 896 reports · 1.7% of its reports
Death after Febantel + Praziquantel + Pyrantel (Drontal Plus) 214 reports · 3.2% of its reports
Death after Pyrantel 693 reports · 14% of its reports
Death after Praziquantel + Pyrantel 244 reports · 6.6% of its reports
Death after Praziquantel 50 reports · 4.5% of its reports

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