Blood in vomit after Fenbendazole in dogs

The FDA has received 44 reports of blood in vomit in dogs after Fenbendazole. That is 0.7% of all reports for this medicine, compared with 0.4% across reports for all dog medicines, so it is reported unusually often with this medicine.

44Reports

50%Marked serious

14%Recovered

23%Died or euthanised

3 daysTypical onset

How soon it started

Same day

6 26%

1–2 days

5 22%

3–7 days

3 13%

1–4 weeks

5 22%

Over a month

4 17%

How the animals did

Recovered

6 14%

Still unwell when reported

11 25%

Died

8 18%

Euthanised

2 4.5%

Not known

17 39%

Problems reported at the same time

28 64%

18 41%

14 32%

12 27%

10 23%

6 14%

5 11%

4 9.1%

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 blood in vomit in dogs?: 44 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).

Blood in vomit with similar medicines

Blood in vomit after Pyrantel + Sarolaner (Simparica Trio) 114 reports · 0.2% of its reports
Blood in vomit after Febantel + Praziquantel + Pyrantel (Drontal Plus) 20 reports · 0.3% of its reports
Blood in vomit after Pyrantel 47 reports · 1.0% of its reports
Blood in vomit after Praziquantel + Pyrantel 38 reports · 1.0% of its reports

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