Famotidine — 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. Famotidine is a veterinary active ingredient.
Total reports
Famotidine: 2995
Reports by species (top entries)
- Dog 2577
- Cat 402
- Human 9
- Goat 2
- Parrot 2
- Ferret 1
Top reported reactions (VEDDRA terms, top entries)
- Vomiting 874
- Lethargy (see also Central nervous system depression in 'Neurological') 656
- Diarrhoea 520
- Anorexia 487
- Death by euthanasia 425
- Other abnormal test result NOS 395
- Elevated alanine aminotransferase (ALT) 347
- Weight loss 284
- Death 281
- Decreased appetite 278
"Lack of efficacy" terms denote product-performance reports, not adverse reactions.
Source JSON: pdf-raw/ade/ade_active_ingredients_2026-07-22_b6.json (openFDA animalandveterinary/event.json, pulled 2026-07-22).