Animal & veterinary · openFDA

Animal drug adverse event reports

Reports of adverse events in animals given veterinary drugs, by species, drug and reaction. 1,378,854 records; openFDA updated it 2026-11-09. About this dataset

Newest records

Most reported reactions
  • Vomiting215,756
  • Diarrhoea83,314
  • Lethargy (see also Central nervous system depression in 'Neurological')76,433
  • Emesis69,533
  • INEFFECTIVE, HEARTWORM LARVAE69,277
  • Lack of efficacy (ectoparasite) - flea65,571
  • Anorexia59,808
  • Lack of efficacy - NOS57,453
  • MSK

    Dog · Reactions: Lack of efficacy (endoparasite) - tapeworm, Medication error NOS, Intentional misuse

    Other Health Care ProfessionalSerious
  • MSK

    Dog · Reactions: Decreased appetite, Vomiting, Not defecating +2

    Veterinarian
  • MSK

    Dog · Reactions: Immune mediated haemolytic anaemia, Death by euthanasia, Lethargy (see also Central nervous system depression in Neurological) +4

    Other Health Care ProfessionalSerious
  • MSK

    Dog · Reactions: Diarrhoea

    VeterinarianSerious
  • MSK

    Dog · Reactions: Lack of efficacy (ectoparasite) - flea

    Animal Owner
  • MSK

    Dog · Reactions: Lack of efficacy (endoparasite) - heartworm

    Other Health Care ProfessionalSerious
  • MSK

    Dog · Reactions: Lack of efficacy (bacteria) - Ehrlichia, Medication error NOS, Lack of efficacy (ectoparasite) - tick NOS +1

    VeterinarianSerious
  • MSK

    Dog · Reactions: Lack of efficacy (endoparasite) - hookworm

    VeterinarianSerious
  • MSK

    Dog · Reactions: Other abnormal test result NOS

    Other
  • MSK

    Dog · Reactions: Lack of efficacy (endoparasite) - hookworm

    Other Health Care ProfessionalSerious
  • MSK

    Dog · Reactions: Vomiting

    Veterinarian
  • MSK

    Dog · Reactions: Tremor of limb, Emesis (multiple), Lethargy (see also Central nervous system depression in Neurological) +2

    Veterinarian
  • MSK

    Dog · Reactions: Lack of efficacy (endoparasite) - heartworm

    VeterinarianSerious
  • MSK

    Dog · Reactions: Lack of efficacy (bacteria) - Borrelia

    Other Health Care Professional
  • MSK

    Cat · Reactions: Not eating, Lethargy (see also Central nervous system depression in Neurological), Diarrhoea +6

    VeterinarianSerious
  • MSK

    Dog · Reactions: Lack of efficacy (endoparasite) - tapeworm

    Other Health Care ProfessionalSerious
  • MSK

    Dog · Reactions: Lack of efficacy (endoparasite) - hookworm

    Other Health Care ProfessionalSerious
  • MSK

    Reactions: Product syringe issue

    Animal Owner
  • MSK

    Reactions: Appearance, Abnormal

    Other
  • MSK

    Cat · Reactions: Lack of efficacy - NOS, Medication error NOS

    VeterinarianSerious
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How to read this: Each report says someone told FDA an event happened while a product was used. A report does not show the product caused it, and counts rise and fall with how many people report. Data from openFDA, FDA's public API. FDA says not to rely on it to make decisions about medical care and to treat every result as unvalidated; confirm against FDA's own record and the product labeling. Not medical or legal advice.