Ondansetron side effects in cats

218 reports sent to the FDA between 2013 and 2026 involve Ondansetron in cats. The most reported problems were loss of appetite, lethargy, vomiting. 67% were marked serious, and where it was recorded, signs eased after stopping the medicine in 0% of cases.

218Reports
67%Marked serious
0.0%Only medicine involved
22%Recovered
22%Died or euthanised
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About this medicine

Type: medicine.

Most reported side effects

Share = percentage of this medicine's reports that mention the problem. One report can list several problems.

Reports that it didn't work

Some reports are about the medicine not working (for example a cat still getting fleas or heartworm), not about a side effect.

Didn't stop worms
1 0.5%
Didn't stop fleas
1 0.5%

How soon problems started

Same day
65 33%
1–2 days
37 19%
3–7 days
27 14%
1–4 weeks
25 13%
Over a month
42 21%

Time from the first dose to the first sign, where both dates were reported (196 reports).

How the animals did

Recovered
47 22%
Still unwell when reported
80 37%
Died
13 6.0%
Euthanised
35 16%
Not known
43 20%

Breeds named most often

Popular breeds appear more often because there are more of them.

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