Weight loss after Robenacoxib (Onsior) in cats

The FDA has received 229 reports of weight loss in cats after Robenacoxib. That is 7.0% of all reports for this medicine, compared with 4.6% across reports for all cat medicines, so it is reported unusually often with this medicine.

229Reports
80%Marked serious
16%Recovered
25%Died or euthanised
3 daysTypical onset
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How soon it started

Same day
44 23%
1–2 days
40 21%
3–7 days
45 23%
1–4 weeks
25 13%
Over a month
38 20%

How the animals did

Recovered
36 16%
Recovered with lasting effects
1 0.4%
Still unwell when reported
90 39%
Died
21 9.2%
Euthanised
37 16%
Not known
44 19%

Problems reported at the same time

Age of the animals

Under 1 year
36
1–3 years
31
4–7 years
39
8–11 years
56
12+ years
66

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 weight loss in cats?
229 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).

Weight loss with similar medicines

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