Florfenicol — 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. Florfenicol is a broad-spectrum antibiotic (aquatic / food-animal, some companion use).
Total reports
Florfenicol: 6898
Reports by species (top entries)
- Dog 4541
- Cat 672
- Cattle 347
- Human 270
- Fish 47
- Pig 32
Top reported reactions (VEDDRA terms, top entries)
- Lack of efficacy - NOS 1765
- Ataxia 609
- Head tilt - ear disorder 456
- Vomiting 455
- Ear discharge 382
- Head shake - ear disorder 339
- Nystagmus 327
- Behavioural disorder NOS 313
- Lethargy (see also Central nervous system depression in 'Neurological') 310
- Anorexia 292
"Lack of efficacy" terms denote product-performance reports, not adverse reactions.
Source JSON: pdf-raw/ade/ade_active_ingredients_2026-07-22_b8.json (openFDA animalandveterinary/event.json, pulled 2026-07-22).