Dilated pupils after Robenacoxib (Onsior) in cats

146 reports to the FDA describe dilated pupils in cats given Robenacoxib. That is 4.5% of all reports for this medicine, compared with 1.4% across reports for all cat medicines, so it is reported unusually often with this medicine.

146Reports
48%Marked serious
28%Recovered
16%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
74 53%
1–2 days
41 29%
3–7 days
9 6.5%
1–4 weeks
9 6.5%
Over a month
6 4.3%

How the animals did

Recovered
40 27%
Recovered with lasting effects
1 0.7%
Still unwell when reported
57 39%
Died
15 10%
Euthanised
8 5.5%
Not known
25 17%

Problems reported at the same time

Age of the animals

Under 1 year
19
1–3 years
26
4–7 years
35
8–11 years
24
12+ years
36

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 dilated pupils in cats?
146 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 the same 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).

Dilated pupils with similar medicines

All reported side effects of Robenacoxib in cats · Medicines most reported with dilated pupils