Lameness after Robenacoxib (Onsior) in cats

93 reports to the FDA describe lameness in cats given Robenacoxib. That is 2.8% of all reports for this medicine, compared with 0.6% across reports for all cat medicines, so it is reported unusually often with this medicine.

93Reports

54%Marked serious

27%Recovered

13%Died or euthanised

3 daysTypical onset

How soon it started

Same day

22 27%

1–2 days

15 18%

3–7 days

17 21%

1–4 weeks

18 22%

Over a month

10 12%

How the animals did

Recovered

25 27%

Still unwell when reported

40 43%

Died

1 1.1%

Euthanised

11 12%

Not known

16 17%

Problems reported at the same time

37 40%

34 37%

24 26%

19 20%

17 18%

Injection site reaction

16 17%

Pain

14 15%

Didn't work as expected

13 14%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

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 lameness in cats?: 93 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 3 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).

Lameness with similar medicines

Lameness after Meloxicam (Metacam) 34 reports · 0.9% of its reports

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