Behaviour change after Butorphanol in cats

The FDA has received 213 reports of behaviour change in cats after Butorphanol. That is 9.5% of all reports for this medicine, compared with 5.4% across reports for all cat medicines, so it is reported unusually often with this medicine.

213Reports
41%Marked serious
33%Recovered
15%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
107 57%
1–2 days
54 29%
3–7 days
15 7.9%
1–4 weeks
7 3.7%
Over a month
6 3.2%

How the animals did

Recovered
69 32%
Recovered with lasting effects
1 0.5%
Still unwell when reported
66 31%
Died
15 7.0%
Euthanised
17 8.0%
Not known
45 21%

Problems reported at the same time

Age of the animals

Under 1 year
62
1–3 years
25
4–7 years
45
8–11 years
29
12+ years
39

About this medicine

Type: medicine.

Questions owners ask

Can Butorphanol cause behaviour change in cats?
213 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).

Behaviour change with similar medicines

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