Monocytosis after Butorphanol in dogs

64 reports to the FDA describe monocytosis in dogs given Butorphanol. That is 1.4% of all reports for this medicine, compared with 0.3% across reports for all dog medicines, so it is reported unusually often with this medicine.

64Reports
80%Marked serious
14%Recovered
34%Died or euthanised
3 daysTypical onset
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How soon it started

Same day
13 23%
1–2 days
11 19%
3–7 days
10 18%
1–4 weeks
12 21%
Over a month
11 19%

How the animals did

Recovered
9 14%
Still unwell when reported
14 22%
Died
12 19%
Euthanised
10 16%
Not known
19 30%

Problems reported at the same time

Age of the animals

Under 1 year
7
1–3 years
12
4–7 years
18
8–11 years
18
12+ years
8

About this medicine

Type: medicine.

Questions owners ask

Can Butorphanol cause monocytosis in dogs?
64 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 3 days 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).

Monocytosis with similar medicines

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