Collapse after Butorphanol in cats

The FDA has received 23 reports of collapse in cats after Butorphanol. That is 1.0% of all reports for this medicine, compared with 0.5% across reports for all cat medicines, so it is reported unusually often with this medicine.

23Reports

83%Marked serious

35%Recovered

43%Died or euthanised

Same dayTypical onset

How soon it started

Same day

9 53%

1–2 days

5 29%

3–7 days

1 5.9%

1–4 weeks

1 5.9%

Over a month

1 5.9%

How the animals did

Recovered

8 35%

Died

9 39%

Euthanised

1 4.3%

Not known

5 22%

Problems reported at the same time

10 43%

8 35%

6 26%

5 22%

4 17%

4 17%

4 17%

3 13%

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 collapse in cats?: 23 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).

Collapse with similar medicines

Collapse after Ketamine 25 reports · 0.8% of its reports
Collapse after Methylprednisolone 26 reports · 1.6% of its reports

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