Wobbliness (ataxia) after Robenacoxib (Onsior) in cats

187 reports to the FDA describe wobbliness (ataxia) in cats given Robenacoxib. That is 5.7% of all reports for this medicine, compared with 4.7% across reports for all cat medicines.

187Reports
65%Marked serious
18%Recovered
27%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
67 40%
1–2 days
57 34%
3–7 days
16 9.5%
1–4 weeks
11 6.5%
Over a month
17 10%

How the animals did

Recovered
33 18%
Recovered with lasting effects
1 0.5%
Still unwell when reported
73 39%
Died
13 7.0%
Euthanised
37 20%
Not known
30 16%

Problems reported at the same time

Age of the animals

Under 1 year
38
1–3 years
20
4–7 years
43
8–11 years
46
12+ years
39

About this medicine

Robenacoxib relieves pain and inflammation (short courses).

Products with this ingredient include Onsior. The FDA hides brand names in its public data, so these reports cover every product with the same active ingredients.

NSAIDs can affect the stomach, liver and kidneys. Vets usually recommend blood tests before and during long-term use.

Questions owners ask

Can Robenacoxib cause wobbliness (ataxia) in cats?
187 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 1 day 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).

Wobbliness (ataxia) with similar medicines

All reported side effects of Robenacoxib in cats · Medicines most reported with wobbliness (ataxia)