Breathing problems after Ondansetron in dogs

95 reports to the FDA describe breathing problems in dogs given Ondansetron. That is 14% of all reports for this medicine, compared with 2.7% across reports for all dog medicines, so it is reported unusually often with this medicine.

95Reports
96%Marked serious
13%Recovered
51%Died or euthanised
2 daysTypical onset
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How soon it started

Same day
26 33%
1–2 days
19 24%
3–7 days
5 6.3%
1–4 weeks
12 15%
Over a month
17 22%

How the animals did

Recovered
12 13%
Still unwell when reported
28 29%
Died
20 21%
Euthanised
28 29%
Not known
7 7.4%

Problems reported at the same time

Age of the animals

Under 1 year
6
1–3 years
12
4–7 years
39
8–11 years
25
12+ years
12

About this medicine

Type: medicine.

Questions owners ask

Can Ondansetron cause breathing problems in dogs?
95 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).

Breathing problems with similar medicines

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