Didn't work as expected after Ondansetron in dogs

117 reports to the FDA describe didn't work as expected in dogs given Ondansetron. That is 18% of all reports for this medicine, compared with 13% across reports for all dog medicines.

117Reports
76%Marked serious
6.8%Recovered
34%Died or euthanised
8 daysTypical onset
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How soon it started

Same day
22 23%
1–2 days
15 15%
3–7 days
11 11%
1–4 weeks
18 19%
Over a month
31 32%

How the animals did

Recovered
8 6.8%
Still unwell when reported
41 35%
Died
16 14%
Euthanised
24 21%
Not known
28 24%

Problems reported at the same time

Age of the animals

Under 1 year
20
1–3 years
27
4–7 years
28
8–11 years
23
12+ years
18

About this medicine

Type: medicine.

Questions owners ask

Can Ondansetron cause didn't work as expected in dogs?
117 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 8 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).

Didn't work as expected with similar medicines

All reported side effects of Ondansetron in dogs · Medicines most reported with didn't work as expected