Behaviour change after Butorphanol in dogs

151 reports to the FDA describe behaviour change in dogs given Butorphanol. That is 3.4% of all reports for this medicine, compared with 2.5% across reports for all dog medicines.

151Reports
63%Marked serious
30%Recovered
21%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
57 49%
1–2 days
16 14%
3–7 days
12 10%
1–4 weeks
9 7.8%
Over a month
22 19%

How the animals did

Recovered
45 30%
Recovered with lasting effects
1 0.7%
Still unwell when reported
39 26%
Died
17 11%
Euthanised
14 9.3%
Not known
35 23%

Problems reported at the same time

Age of the animals

Under 1 year
11
1–3 years
34
4–7 years
46
8–11 years
32
12+ years
20

About this medicine

Type: medicine.

Questions owners ask

Can Butorphanol cause behaviour change in dogs?
151 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).

Behaviour change with similar medicines

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