Bradycardia after Butorphanol in dogs

353 reports to the FDA describe bradycardia in dogs given Butorphanol. That is 7.9% of all reports for this medicine, compared with 0.3% across reports for all dog medicines, so it is reported unusually often with this medicine.

353Reports
65%Marked serious
55%Recovered
18%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
274 95%
1–2 days
4 1.4%
3–7 days
4 1.4%
1–4 weeks
1 0.3%
Over a month
5 1.7%

How the animals did

Recovered
193 55%
Still unwell when reported
50 14%
Died
56 16%
Euthanised
6 1.7%
Not known
48 14%

Problems reported at the same time

Age of the animals

Under 1 year
45
1–3 years
88
4–7 years
90
8–11 years
59
12+ years
12

About this medicine

Type: medicine.

Questions owners ask

Can Butorphanol cause bradycardia in dogs?
353 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).

Bradycardia with similar medicines

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