Incorrect dose administered after Fenbendazole in dogs

The FDA has received 29 reports of incorrect dose administered in dogs after Fenbendazole. That is 0.5% 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.

29Reports

38%Marked serious

34%Recovered

17%Died or euthanised

1 daysTypical onset

How soon it started

Same day

9 38%

1–2 days

9 38%

3–7 days

3 13%

1–4 weeks

1 4.2%

Over a month

2 8.3%

How the animals did

Recovered

10 34%

Still unwell when reported

6 21%

Died

5 17%

Not known

8 28%

Problems reported at the same time

16 55%

12 41%

10 34%

9 31%

7 24%

6 21%

5 17%

5 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 incorrect dose administered in dogs?: 29 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).

Incorrect dose administered with similar medicines

Incorrect dose administered after Febantel + Praziquantel + Pyrantel (Drontal Plus) 65 reports · 1.0% of its reports
Incorrect dose administered after Praziquantel + Pyrantel 32 reports · 0.9% of its reports

All reported side effects of Fenbendazole in dogs · Medicines most reported with incorrect dose administered