Levetiracetam — 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 2026-07-21. Counts are report-level: one report may list multiple reactions and multiple animals, so figures are not additive and do not imply causation. Levetiracetam is a veterinary active ingredient.
Total reports
Levetiracetam: 686
Reports by species (top entries)
- Dog 647
- Cat 37
- Human 1
Top reported reactions (VEDDRA terms, top entries)
- Seizure NOS 323
- Vomiting 74
- Death by euthanasia 73
- Lethargy (see also Central nervous system depression in 'Neurological') 58
- Ataxia 55
- Behavioural disorder NOS 37
- Elevated alanine aminotransferase (ALT) 37
- Tremor 37
- Lack of efficacy - NOS 36
- Diarrhoea 35
"Lack of efficacy" terms denote product-performance reports, not adverse reactions.
Source JSON: pdf-raw/ade/ade_active_ingredients_2026-07-21.json (openFDA animalandveterinary/event.json, pulled 2026-07-21).