Death after Robenacoxib (Onsior) in cats

531 reports to the FDA describe death in cats given Robenacoxib. That is 16% of all reports for this medicine, compared with 8.9% across reports for all cat medicines, so it is reported unusually often with this medicine.

531Reports

92%Marked serious

0.0%Recovered

100%Died or euthanised

1 daysTypical onset

How soon it started

Same day

161 37%

1–2 days

115 26%

3–7 days

61 14%

1–4 weeks

42 9.6%

Over a month

60 14%

How the animals did

Died

280 53%

Euthanised

250 47%

Not known

1 0.2%

Problems reported at the same time

177 33%

139 26%

138 26%

80 15%

71 13%

69 13%

68 13%

57 11%

Age of the animals

Under 1 year

107

1–3 years

4–7 years

8–11 years

12+ years

131

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 death in cats?: 531 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).

Death with similar medicines

Death after Meloxicam (Metacam) 865 reports · 24% of its reports
Death after Carprofen (Rimadyl) 164 reports · 9.6% of its reports
Death after Deracoxib (Deramaxx) 27 reports · 27% of its reports

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