Hyperphosphataemia after Butorphanol in cats

The FDA has received 43 reports of hyperphosphataemia in cats after Butorphanol. That is 1.9% of all reports for this medicine, compared with 1.0% across reports for all cat medicines, so it is reported unusually often with this medicine.

43Reports

77%Marked serious

19%Recovered

33%Died or euthanised

2 daysTypical onset

How soon it started

Same day

8 22%

1–2 days

19 51%

3–7 days

5 14%

1–4 weeks

3 8.1%

Over a month

2 5.4%

How the animals did

Recovered

7 16%

Recovered with lasting effects

1 2.3%

Still unwell when reported

13 30%

Died

3 7.0%

Euthanised

11 26%

Not known

8 19%

Problems reported at the same time

38 88%

29 67%

27 63%

21 49%

14 33%

14 33%

Hyperkalaemia

13 30%

Hyperglycaemia

12 28%

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 hyperphosphataemia in cats?: 43 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 2 days 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).

Hyperphosphataemia with similar medicines

Hyperphosphataemia after Ketamine 38 reports · 1.2% of its reports
Hyperphosphataemia after Isoflurane 35 reports · 1.7% of its reports
Hyperphosphataemia after Methylprednisolone 20 reports · 1.2% of its reports
Hyperphosphataemia after Propofol 27 reports · 2.3% of its reports
Hyperphosphataemia after Molidustat 28 reports · 4.6% of its reports

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