Death after Fentanyl in cats

The FDA has received 25 reports of death in cats after Fentanyl. That is 30% 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.

25Reports
96%Marked serious
0.0%Recovered
100%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
10 50%
1–2 days
3 15%
3–7 days
2 10%
1–4 weeks
1 5.0%
Over a month
4 20%

How the animals did

Died
11 44%
Euthanised
14 56%

Problems reported at the same time

Kidney problems
7 28%
Swelling
6 24%
Lethargy
6 24%
Hypotension
6 24%
Vomiting
5 20%
Blood problems
5 20%
Liver problems
5 20%

Age of the animals

Under 1 year
1
1–3 years
7
4–7 years
5
8–11 years
6
12+ years
4

About this medicine

Type: medicine.

Questions owners ask

Can Fentanyl cause death in cats?
25 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).

Death with similar medicines

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