Apnoea after Butorphanol in cats

The FDA has received 90 reports of apnoea in cats after Butorphanol. That is 4.0% of all reports for this medicine, compared with 0.5% across reports for all cat medicines, so it is reported unusually often with this medicine.

90Reports
46%Marked serious
17%Recovered
67%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
42 100%
1–2 days
0 0.0%
3–7 days
0 0.0%
1–4 weeks
0 0.0%
Over a month
0 0.0%

How the animals did

Recovered
15 17%
Still unwell when reported
5 5.6%
Died
59 66%
Euthanised
1 1.1%
Not known
10 11%

Problems reported at the same time

Age of the animals

Under 1 year
44
1–3 years
15
4–7 years
12
8–11 years
2
12+ years
5

About this medicine

Type: medicine.

Questions owners ask

Can Butorphanol cause apnoea in cats?
90 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 the same 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).

Apnoea with similar medicines

All reported side effects of Butorphanol in cats · Medicines most reported with apnoea