Blood problems after Robenacoxib (Onsior) in cats

The FDA has received 174 reports of blood problems in cats after Robenacoxib. That is 5.3% of all reports for this medicine, compared with 1.9% across reports for all cat medicines, so it is reported unusually often with this medicine.

174Reports
84%Marked serious
14%Recovered
28%Died or euthanised
3 daysTypical onset
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How soon it started

Same day
35 23%
1–2 days
34 22%
3–7 days
34 22%
1–4 weeks
34 22%
Over a month
16 10%

How the animals did

Recovered
24 14%
Still unwell when reported
76 44%
Died
17 9.8%
Euthanised
32 18%
Not known
25 14%

Problems reported at the same time

Age of the animals

Under 1 year
24
1–3 years
40
4–7 years
30
8–11 years
38
12+ years
39

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 blood problems 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 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).

Blood problems with similar medicines

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