Dehydration after Butorphanol in cats

The FDA has received 70 reports of dehydration in cats after Butorphanol. That is 3.1% of all reports for this medicine, compared with 2.0% across reports for all cat medicines, so it is reported unusually often with this medicine.

70Reports
67%Marked serious
23%Recovered
31%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
19 31%
1–2 days
22 36%
3–7 days
11 18%
1–4 weeks
8 13%
Over a month
1 1.6%

How the animals did

Recovered
16 23%
Still unwell when reported
22 31%
Died
10 14%
Euthanised
12 17%
Not known
10 14%

Problems reported at the same time

Age of the animals

Under 1 year
12
1–3 years
9
4–7 years
14
8–11 years
20
12+ years
15

About this medicine

Type: medicine.

Questions owners ask

Can Butorphanol cause dehydration in cats?
70 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).

Dehydration with similar medicines

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