Loss of appetite after Fenbendazole in cats

49 reports to the FDA describe loss of appetite in cats given Fenbendazole. That is 17% of all reports for this medicine, compared with 14% across reports for all cat medicines.

49Reports
53%Marked serious
29%Recovered
14%Died or euthanised
4 daysTypical onset
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How soon it started

Same day
4 9.8%
1–2 days
10 24%
3–7 days
12 29%
1–4 weeks
11 27%
Over a month
4 9.8%

How the animals did

Recovered
14 29%
Still unwell when reported
12 24%
Died
6 12%
Euthanised
1 2.0%
Not known
16 33%

Problems reported at the same time

22 45%
14 29%
7 14%
Drooling
6 12%
Weight loss
5 10%
Decreased activity
5 10%

Age of the animals

Under 1 year
25
1–3 years
8
4–7 years
7
8–11 years
3
12+ years
2

About this medicine

Fenbendazole treats intestinal worms and some other parasites.

Questions owners ask

Can Fenbendazole cause loss of appetite in cats?
49 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 4 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).

Loss of appetite with similar medicines

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