Vomiting after Ondansetron in cats

58 reports to the FDA describe vomiting in cats given Ondansetron. That is 27% of all reports for this medicine, compared with 18% across reports for all cat medicines, so it is reported unusually often with this medicine.

58Reports
81%Marked serious
14%Recovered
28%Died or euthanised
5 daysTypical onset
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How soon it started

Same day
13 28%
1–2 days
6 13%
3–7 days
8 17%
1–4 weeks
9 20%
Over a month
10 22%

How the animals did

Recovered
8 14%
Still unwell when reported
23 40%
Died
4 6.9%
Euthanised
12 21%
Not known
11 19%

Problems reported at the same time

Age of the animals

Under 1 year
8
1–3 years
6
4–7 years
9
8–11 years
16
12+ years
19

About this medicine

Type: medicine.

Questions owners ask

Can Ondansetron cause vomiting in cats?
58 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 5 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).

Vomiting with similar medicines

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