Kidney problems after Butorphanol in cats

The FDA has received 137 reports of kidney problems in cats after Butorphanol. That is 6.1% of all reports for this medicine, compared with 4.5% across reports for all cat medicines.

137Reports
73%Marked serious
11%Recovered
42%Died or euthanised
2 daysTypical onset
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How soon it started

Same day
32 29%
1–2 days
35 32%
3–7 days
24 22%
1–4 weeks
13 12%
Over a month
6 5.5%

How the animals did

Recovered
15 11%
Still unwell when reported
37 27%
Died
26 19%
Euthanised
31 23%
Not known
28 20%

Problems reported at the same time

Age of the animals

Under 1 year
16
1–3 years
22
4–7 years
36
8–11 years
33
12+ years
29

About this medicine

Type: medicine.

Questions owners ask

Can Butorphanol cause kidney problems in cats?
137 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).

Kidney problems with similar medicines

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