Death after Onsior in cats

46 reports to the FDA describe death in cats given Onsior. That is 26% 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.

46Reports
100%Marked serious
0.0%Recovered
100%Died or euthanised
4 daysTypical onset
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How soon it started

Same day
16 35%
1–2 days
4 8.7%
3–7 days
10 22%
1–4 weeks
9 20%
Over a month
7 15%

How the animals did

Died
18 39%
Euthanised
28 61%

Problems reported at the same time

17 37%
Weight loss
9 20%
Kidney problems
8 17%
8 17%
Hiding
7 15%
Vocalising
7 15%

Age of the animals

Under 1 year
6
1–3 years
1
4–7 years
9
8–11 years
8
12+ years
19

About this medicine

Type: medicine.

Questions owners ask

Can Onsior cause death in cats?
46 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 4 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).

Death with similar medicines

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