Allergic reaction after Butorphanol in horses

47 reports to the FDA describe allergic reaction in horses given Butorphanol. That is 16% of all reports for this medicine, compared with 7.5% across reports for all horse medicines, so it is reported unusually often with this medicine.

47Reports

53%Marked serious

70%Recovered

21%Died or euthanised

Same dayTypical onset

How soon it started

Same day

33 89%

1–2 days

2 5.4%

3–7 days

0 0.0%

1–4 weeks

1 2.7%

Over a month

1 2.7%

How the animals did

Recovered

33 70%

Still unwell when reported

1 2.1%

Died

8 17%

Euthanised

2 4.3%

Not known

3 6.4%

Problems reported at the same time

Pale mucous membrane

10 21%

10 21%

10 21%

5 11%

5 11%

Excessive sweating

5 11%

Underdose

4 8.5%

Hyperhidrosis

3 6.4%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Type: medicine.

Questions owners ask

Can Butorphanol cause allergic reaction in horses?: 47 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).

Allergic reaction with similar medicines

Allergic reaction after Pergolide 23 reports · 1.9% of its reports
Allergic reaction after Ceftiofur 118 reports · 9.7% of its reports
Allergic reaction after Detomidine 165 reports · 17% of its reports
Allergic reaction after Flunixin Meglumine 104 reports · 17% of its reports
Allergic reaction after Polysulfated Glycosaminoglycan 75 reports · 15% of its reports
Allergic reaction after Xylazine 30 reports · 6.5% of its reports
Allergic reaction after Hyaluronate Sodium 20 reports · 4.8% of its reports
Allergic reaction after Pentosan Polysulfate Sodium 32 reports · 16% of its reports
Allergic reaction after Selenium Vitamin E 39 reports · 47% of its reports
Allergic reaction after Penicillin G Procaine 21 reports · 26% of its reports

All reported side effects of Butorphanol in horses · Medicines most reported with allergic reaction