Lameness after Butorphanol in dogs

The FDA has received 125 reports of lameness in dogs after Butorphanol. That is 2.8% of all reports for this medicine, compared with 0.6% across reports for all dog medicines, so it is reported unusually often with this medicine.

125Reports
66%Marked serious
27%Recovered
19%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
33 31%
1–2 days
27 25%
3–7 days
15 14%
1–4 weeks
23 22%
Over a month
8 7.5%

How the animals did

Recovered
33 26%
Recovered with lasting effects
1 0.8%
Still unwell when reported
18 14%
Died
10 8.0%
Euthanised
14 11%
Not known
49 39%

Problems reported at the same time

Age of the animals

Under 1 year
10
1–3 years
10
4–7 years
50
8–11 years
42
12+ years
8

About this medicine

Type: medicine.

Questions owners ask

Can Butorphanol cause lameness in dogs?
125 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 1 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).

Lameness with similar medicines

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