Not sleeping after Fenbendazole in dogs

22 reports to the FDA describe not sleeping in dogs given Fenbendazole. That is 0.4% 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.

22Reports

32%Marked serious

55%Recovered

4.5%Died or euthanised

Same dayTypical onset

How soon it started

Same day

11 65%

1–2 days

3 18%

3–7 days

2 12%

1–4 weeks

1 5.9%

Over a month

0 0.0%

How the animals did

Recovered

12 55%

Still unwell when reported

6 27%

Euthanised

1 4.5%

Not known

3 14%

Problems reported at the same time

Restlessness or agitation

16 73%

7 32%

5 23%

4 18%

4 18%

3 14%

2 9.1%

Didn't work as expected

2 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 not sleeping in dogs?: 22 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 the same 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 sleeping with similar medicines

Not sleeping after Pyrantel + Sarolaner (Simparica Trio) 46 reports · 0.1% of its reports
Not sleeping after Febantel + Praziquantel + Pyrantel (Drontal Plus) 29 reports · 0.4% of its reports

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