Azathioprine — 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. Azathioprine is a active ingredient.
Total reports
Azathioprine: 106
Reports by species (top entries)
- Dog 106
Top reported reactions (VEDDRA terms, top entries)
- Lethargy (see also Central nervous system depression in 'Neurological') 26
- Death by euthanasia 21
- Elevated serum alkaline phosphatase (SAP) 21
- Anaemia NOS 20
- Immune mediated haemolytic anaemia 20
- Vomiting 19
- Diarrhoea 18
- Other abnormal test result NOS 18
- Elevated alanine aminotransferase (ALT) 17
- Leucocytosis NOS 16
Source JSON: pdf-raw/ade/ade_active_ingredients_2026-07-22_b20.json (openFDA animalandveterinary/event.json, pulled 2026-07-22).