Dehydration after Robenacoxib (Onsior) in cats

The FDA has received 159 reports of dehydration in cats after Robenacoxib. That is 4.9% of all reports for this medicine, compared with 2.0% across reports for all cat medicines, so it is reported unusually often with this medicine.

159Reports
77%Marked serious
19%Recovered
33%Died or euthanised
2 daysTypical onset
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How soon it started

Same day
34 24%
1–2 days
56 40%
3–7 days
23 16%
1–4 weeks
16 11%
Over a month
12 8.5%

How the animals did

Recovered
29 18%
Recovered with lasting effects
1 0.6%
Still unwell when reported
56 35%
Died
19 12%
Euthanised
33 21%
Not known
21 13%

Problems reported at the same time

Age of the animals

Under 1 year
24
1–3 years
31
4–7 years
27
8–11 years
35
12+ years
40

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 dehydration in cats?
159 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 2 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).

Dehydration with similar medicines

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