Pale mucous membrane after Fenbendazole in dogs

The FDA has received 62 reports of pale mucous membrane in dogs after Fenbendazole. That is 1.1% of all reports for this medicine, compared with 0.7% across reports for all dog medicines.

62Reports

76%Marked serious

4.8%Recovered

39%Died or euthanised

2 daysTypical onset

How soon it started

Same day

7 16%

1–2 days

15 35%

3–7 days

5 12%

1–4 weeks

9 21%

Over a month

7 16%

How the animals did

Recovered

3 4.8%

Still unwell when reported

18 29%

Died

15 24%

Euthanised

9 15%

Not known

17 27%

Problems reported at the same time

35 56%

28 45%

24 39%

24 39%

21 34%

20 32%

11 18%

Decreased packed cell volume (pcv)

10 16%

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 pale mucous membrane in dogs?: 62 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 2 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).

Pale mucous membrane with similar medicines

Pale mucous membrane after Pyrantel + Sarolaner (Simparica Trio) 119 reports · 0.2% of its reports
Pale mucous membrane after Febantel + Praziquantel + Pyrantel (Drontal Plus) 35 reports · 0.5% of its reports
Pale mucous membrane after Pyrantel 140 reports · 2.9% of its reports
Pale mucous membrane after Praziquantel + Pyrantel 35 reports · 0.9% of its reports

All reported side effects of Fenbendazole in dogs · Medicines most reported with pale mucous membrane