Phenylbutazone — FDA Animal & Veterinary Adverse Event (ADE) Reports
Source: openFDA animalandveterinary/event.json, the FDA Center for Veterinary Medicine (CVM) adverse event report database. Data pulled 2026-07-22. Counts are report-level: one report may list multiple reactions and multiple animals, so figures are not additive and do not imply causation. Phenylbutazone is a active ingredient.
Total reports
Phenylbutazone: 211
Reports by species (top entries)
- Horse 143
- Dog 19
- Cat 2
- Donkey 1
- Other 1
- Other Equids 1
Top reported reactions (VEDDRA terms, top entries)
- Death 25
- Death by euthanasia 20
- Diarrhoea 18
- Anorexia 17
- Colic 17
- Fever 15
- Elevated blood urea nitrogen (BUN) 14
- Elevated creatinine 14
- Injection site swelling 13
- Abdominal pain 12
Source JSON: pdf-raw/ade/ade_active_ingredients_2026-07-22_b18.json (openFDA animalandveterinary/event.json, pulled 2026-07-22).