Injection site reaction after Robenacoxib (Onsior) in cats

The FDA has received 174 reports of injection site reaction in cats after Robenacoxib. That is 5.3% of all reports for this medicine, compared with 1.2% across reports for all cat medicines, so it is reported unusually often with this medicine.

174Reports
44%Marked serious
15%Recovered
22%Died or euthanised
6 daysTypical onset
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How soon it started

Same day
23 20%
1–2 days
20 18%
3–7 days
18 16%
1–4 weeks
33 29%
Over a month
19 17%

How the animals did

Recovered
24 14%
Recovered with lasting effects
2 1.1%
Still unwell when reported
70 40%
Died
27 16%
Euthanised
12 6.9%
Not known
39 22%

Problems reported at the same time

48 28%
39 22%
30 17%
24 14%
23 13%
16 9.2%

Age of the animals

Under 1 year
57
1–3 years
32
4–7 years
34
8–11 years
32
12+ years
18

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 injection site reaction in cats?
174 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 6 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).

Injection site reaction with similar medicines

All reported side effects of Robenacoxib in cats · Medicines most reported with injection site reaction