Fever after Butorphanol in dogs

The FDA has received 235 reports of fever in dogs after Butorphanol. That is 5.3% of all reports for this medicine, compared with 1.4% across reports for all dog medicines, so it is reported unusually often with this medicine.

235Reports
69%Marked serious
26%Recovered
26%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
97 54%
1–2 days
28 15%
3–7 days
17 9.4%
1–4 weeks
20 11%
Over a month
19 10%

How the animals did

Recovered
61 26%
Still unwell when reported
65 28%
Died
27 11%
Euthanised
35 15%
Not known
47 20%

Problems reported at the same time

Age of the animals

Under 1 year
21
1–3 years
63
4–7 years
59
8–11 years
62
12+ years
16

About this medicine

Type: medicine.

Questions owners ask

Can Butorphanol cause fever in dogs?
235 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).

Fever with similar medicines

All reported side effects of Butorphanol in dogs · Medicines most reported with fever