Fever after Robenacoxib (Onsior) in cats

The FDA has received 426 reports of fever in cats after Robenacoxib. That is 13% of all reports for this medicine, compared with 3.2% across reports for all cat medicines, so it is reported unusually often with this medicine.

426Reports
50%Marked serious
38%Recovered
8.9%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
177 44%
1–2 days
102 25%
3–7 days
44 11%
1–4 weeks
60 15%
Over a month
21 5.2%

How the animals did

Recovered
163 38%
Recovered with lasting effects
1 0.2%
Still unwell when reported
165 39%
Died
19 4.5%
Euthanised
19 4.5%
Not known
59 14%

Problems reported at the same time

Age of the animals

Under 1 year
124
1–3 years
123
4–7 years
81
8–11 years
61
12+ years
21

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 fever in cats?
426 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).

Fever with similar medicines

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