lysine — 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 2026-08-16. Counts are report-level: one report may list multiple reactions and multiple animals, so figures are not additive and do not imply causation. "lysine" is a name as filed in the drug active-ingredient field of these reports (may be a generic ingredient or a product/brand name as reported).
Total reports
lysine: 229
Reports by species (top entries)
- Cat 208
- Horse 8
- Dog 7
- Turkey 2
- Cattle 1
- Turtle dove 1
Top reported reactions (VEDDRA terms, top entries)
- Vomiting 35
- Lethargy (see also Central nervous system depression in 'Neurological') 34
- Anorexia 21
- Behavioural disorder NOS 21
- Weight loss 21
- Death by euthanasia 19
- Lack of efficacy - NOS 19
- Other abnormal test result NOS 19
- Decreased appetite 17
- Anaemia NOS 16
"Lack of efficacy" terms denote product-performance reports, not adverse reactions.
Source JSON: pdf-raw/ade/ade_active_ingredients_2026-08-16_b1.json (openFDA animalandveterinary/event.json, pulled 2026-08-16).