Butorphanol side effects in Thoroughbreds

32 FDA reports involve Butorphanol in a Thoroughbred. These are the problems they describe.

Didn't work as expected
12 38%
Allergic reaction
5 16%
Death
4 13%
Underdose
3 9.4%
Colic
2 6.3%
Sedation prolonged
2 6.3%
Injection site reaction
2 6.3%
Tremors
2 6.3%
Breathing problems
2 6.3%
Fever
2 6.3%
Seizures
2 6.3%
Collapse
2 6.3%

All reports for Butorphanol in horses