Swelling after Butorphanol in cats

110 reports to the FDA describe swelling in cats given Butorphanol. That is 4.9% of all reports for this medicine, compared with 1.9% across reports for all cat medicines, so it is reported unusually often with this medicine.

110Reports
59%Marked serious
20%Recovered
35%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
45 60%
1–2 days
12 16%
3–7 days
10 13%
1–4 weeks
4 5.3%
Over a month
4 5.3%

How the animals did

Recovered
21 19%
Recovered with lasting effects
1 0.9%
Still unwell when reported
27 25%
Died
28 25%
Euthanised
10 9.1%
Not known
23 21%

Problems reported at the same time

Age of the animals

Under 1 year
48
1–3 years
10
4–7 years
21
8–11 years
15
12+ years
13

About this medicine

Type: medicine.

Questions owners ask

Can Butorphanol cause swelling in cats?
110 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).

Swelling with similar medicines

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