Not drinking after Fenbendazole in dogs

The FDA has received 65 reports of not drinking in dogs after Fenbendazole. That is 1.1% of all reports for this medicine, compared with 0.5% across reports for all dog medicines, so it is reported unusually often with this medicine.

65Reports

57%Marked serious

31%Recovered

9.2%Died or euthanised

1 daysTypical onset

How soon it started

Same day

17 29%

1–2 days

24 41%

3–7 days

10 17%

1–4 weeks

5 8.5%

Over a month

3 5.1%

How the animals did

Recovered

20 31%

Still unwell when reported

26 40%

Died

5 7.7%

Euthanised

1 1.5%

Not known

13 20%

Problems reported at the same time

59 91%

34 52%

28 43%

21 32%

11 17%

6 9.2%

6 9.2%

6 9.2%

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 not drinking in dogs?: 65 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).

Not drinking with similar medicines

Not drinking after Pyrantel + Sarolaner (Simparica Trio) 273 reports · 0.5% of its reports
Not drinking after Febantel + Praziquantel + Pyrantel (Drontal Plus) 38 reports · 0.6% of its reports
Not drinking after Pyrantel 41 reports · 0.9% of its reports
Not drinking after Praziquantel + Pyrantel 133 reports · 3.6% of its reports

All reported side effects of Fenbendazole in dogs · Medicines most reported with not drinking