Weight loss after Butorphanol in cats

The FDA has received 86 reports of weight loss in cats after Butorphanol. That is 3.8% of all reports for this medicine, compared with 4.6% across reports for all cat medicines.

86Reports
67%Marked serious
12%Recovered
30%Died or euthanised
2 daysTypical onset
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How soon it started

Same day
20 29%
1–2 days
17 24%
3–7 days
15 21%
1–4 weeks
11 16%
Over a month
7 10%

How the animals did

Recovered
8 9.3%
Recovered with lasting effects
2 2.3%
Still unwell when reported
33 38%
Died
9 10%
Euthanised
17 20%
Not known
17 20%

Problems reported at the same time

Age of the animals

Under 1 year
11
1–3 years
13
4–7 years
15
8–11 years
24
12+ years
22

About this medicine

Type: medicine.

Questions owners ask

Can Butorphanol cause weight loss in cats?
86 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 2 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).

Weight loss with similar medicines

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