Decreased heart rate after Butorphanol in dogs

47 reports to the FDA describe decreased heart rate in dogs given Butorphanol. That is 1.1% of all reports for this medicine, compared with 0.0% across reports for all dog medicines, so it is reported unusually often with this medicine.

47Reports

81%Marked serious

55%Recovered

30%Died or euthanised

Same dayTypical onset

How soon it started

Same day

40 87%

1–2 days

1 2.2%

3–7 days

1 2.2%

1–4 weeks

0 0.0%

Over a month

4 8.7%

How the animals did

Recovered

26 55%

Still unwell when reported

6 13%

Died

13 28%

Euthanised

1 2.1%

Not known

1 2.1%

Problems reported at the same time

14 30%

10 21%

7 15%

5 11%

5 11%

5 11%

5 11%

4 8.5%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Type: medicine.

Questions owners ask

Can Butorphanol cause decreased heart rate in dogs?: 47 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).

Decreased heart rate with similar medicines

Decreased heart rate after Propofol 35 reports · 1.1% of its reports
Decreased heart rate after Isoflurane 46 reports · 1.7% of its reports
Decreased heart rate after Atipamezole 27 reports · 1.0% of its reports
Decreased heart rate after Ketamine 20 reports · 1.1% of its reports

All reported side effects of Butorphanol in dogs · Medicines most reported with decreased heart rate