Weakness after Butorphanol in dogs

The FDA has received 117 reports of weakness in dogs after Butorphanol. That is 2.6% 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.

117Reports
79%Marked serious
18%Recovered
36%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
41 41%
1–2 days
18 18%
3–7 days
11 11%
1–4 weeks
12 12%
Over a month
17 17%

How the animals did

Recovered
20 17%
Recovered with lasting effects
1 0.9%
Still unwell when reported
37 32%
Died
19 16%
Euthanised
23 20%
Not known
17 15%

Problems reported at the same time

Age of the animals

Under 1 year
3
1–3 years
21
4–7 years
22
8–11 years
45
12+ years
26

About this medicine

Type: medicine.

Questions owners ask

Can Butorphanol cause weakness in dogs?
117 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).

Weakness with similar medicines

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