Vocalising after Butorphanol in cats

94 reports to the FDA describe vocalising in cats given Butorphanol. That is 4.2% of all reports for this medicine, compared with 3.1% across reports for all cat medicines.

94Reports
51%Marked serious
15%Recovered
31%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
43 57%
1–2 days
17 23%
3–7 days
5 6.7%
1–4 weeks
9 12%
Over a month
1 1.3%

How the animals did

Recovered
14 15%
Still unwell when reported
32 34%
Died
19 20%
Euthanised
10 11%
Not known
19 20%

Problems reported at the same time

Age of the animals

Under 1 year
17
1–3 years
12
4–7 years
14
8–11 years
23
12+ years
20

About this medicine

Type: medicine.

Questions owners ask

Can Butorphanol cause vocalising in cats?
94 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).

Vocalising with similar medicines

All reported side effects of Butorphanol in cats · Medicines most reported with vocalising