Loss of appetite after Ondansetron in cats

97 reports to the FDA describe loss of appetite in cats given Ondansetron. That is 44% of all reports for this medicine, compared with 14% across reports for all cat medicines, so it is reported unusually often with this medicine.

97Reports
78%Marked serious
16%Recovered
20%Died or euthanised
2 daysTypical onset
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How soon it started

Same day
28 31%
1–2 days
19 21%
3–7 days
11 12%
1–4 weeks
8 9.0%
Over a month
23 26%

How the animals did

Recovered
16 16%
Still unwell when reported
49 51%
Died
4 4.1%
Euthanised
15 15%
Not known
13 13%

Problems reported at the same time

Age of the animals

Under 1 year
5
1–3 years
14
4–7 years
21
8–11 years
17
12+ years
40

About this medicine

Type: medicine.

Questions owners ask

Can Ondansetron cause loss of appetite in cats?
97 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).

Loss of appetite with similar medicines

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