Behaviour change after Robenacoxib (Onsior) in cats

The FDA has received 347 reports of behaviour change in cats after Robenacoxib. That is 11% of all reports for this medicine, compared with 5.4% across reports for all cat medicines, so it is reported unusually often with this medicine.

347Reports
39%Marked serious
25%Recovered
9.8%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
123 38%
1–2 days
93 29%
3–7 days
36 11%
1–4 weeks
34 11%
Over a month
36 11%

How the animals did

Recovered
88 25%
Still unwell when reported
132 38%
Died
21 6.1%
Euthanised
13 3.7%
Not known
93 27%

Problems reported at the same time

Age of the animals

Under 1 year
72
1–3 years
63
4–7 years
83
8–11 years
72
12+ years
41

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 behaviour change in cats?
347 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).

Behaviour change with similar medicines

All reported side effects of Robenacoxib in cats · Medicines most reported with behaviour change