Vomiting after Fenbendazole in cats

69 reports to the FDA describe vomiting in cats given Fenbendazole. That is 24% of all reports for this medicine, compared with 18% across reports for all cat medicines.

69Reports

49%Marked serious

45%Recovered

16%Died or euthanised

1 daysTypical onset

How soon it started

Same day

26 50%

1–2 days

6 12%

3–7 days

4 7.7%

1–4 weeks

11 21%

Over a month

5 9.6%

How the animals did

Recovered

30 43%

Recovered with lasting effects

1 1.4%

Still unwell when reported

10 14%

Died

11 16%

Not known

17 25%

Problems reported at the same time

15 22%

14 20%

13 19%

11 16%

Drooling

6 8.7%

Accidental exposure

5 7.2%

Dehydration

5 7.2%

Weight loss

5 7.2%

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 vomiting in cats?: 69 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).

Vomiting with similar medicines

Vomiting after Emodepside + Praziquantel (Profender) 801 reports · 14% of its reports
Vomiting after Praziquantel 413 reports · 25% of its reports
Vomiting after Praziquantel + Pyrantel 408 reports · 32% of its reports
Vomiting after Pyrantel 113 reports · 20% of its reports
Vomiting after Febantel + Praziquantel + Pyrantel (Drontal Plus) 30 reports · 43% of its reports

All reported side effects of Fenbendazole in cats · Medicines most reported with vomiting