Tremors after Butorphanol in dogs

193 reports to the FDA describe tremors in dogs given Butorphanol. That is 4.3% of all reports for this medicine, compared with 3.4% across reports for all dog medicines.

193Reports
60%Marked serious
35%Recovered
13%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
97 62%
1–2 days
18 11%
3–7 days
19 12%
1–4 weeks
12 7.6%
Over a month
11 7.0%

How the animals did

Recovered
67 35%
Still unwell when reported
61 32%
Died
12 6.2%
Euthanised
13 6.7%
Not known
40 21%

Problems reported at the same time

Age of the animals

Under 1 year
21
1–3 years
52
4–7 years
47
8–11 years
43
12+ years
25

About this medicine

Type: medicine.

Questions owners ask

Can Butorphanol cause tremors in dogs?
193 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).

Tremors with similar medicines

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