Cardiac disorder after Butorphanol in cats

The FDA has received 30 reports of cardiac disorder in cats after Butorphanol. That is 1.3% of all reports for this medicine, compared with 0.2% across reports for all cat medicines, so it is reported unusually often with this medicine.

30Reports

73%Marked serious

37%Recovered

40%Died or euthanised

Same dayTypical onset

How soon it started

Same day

19 76%

1–2 days

1 4.0%

3–7 days

3 12%

1–4 weeks

0 0.0%

Over a month

2 8.0%

How the animals did

Recovered

11 37%

Still unwell when reported

5 17%

Died

10 33%

Euthanised

2 6.7%

Not known

2 6.7%

Problems reported at the same time

12 40%

10 33%

8 27%

8 27%

7 23%

7 23%

6 20%

6 20%

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 cardiac disorder in cats?: 30 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).

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