Vomiting after Ondansetron in dogs

282 reports to the FDA describe vomiting in dogs given Ondansetron. That is 42% of all reports for this medicine, compared with 28% across reports for all dog medicines, so it is reported unusually often with this medicine.

282Reports
77%Marked serious
14%Recovered
35%Died or euthanised
4 daysTypical onset
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How soon it started

Same day
64 27%
1–2 days
45 19%
3–7 days
21 8.8%
1–4 weeks
45 19%
Over a month
64 27%

How the animals did

Recovered
40 14%
Still unwell when reported
108 38%
Died
31 11%
Euthanised
67 24%
Not known
36 13%

Problems reported at the same time

Age of the animals

Under 1 year
22
1–3 years
65
4–7 years
80
8–11 years
72
12+ years
40

About this medicine

Type: medicine.

Questions owners ask

Can Ondansetron cause vomiting in dogs?
282 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).

Vomiting with similar medicines

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