Data sources and methodology

All figures come from the FDA Center for Veterinary Medicine's adverse event reports, published through openFDA. We refresh our copy regularly.

What the numbers mean

• A report means someone told the FDA an animal had a problem after a medicine. It is not proof the medicine caused it.
• The FDA doesn't know how many animals received each medicine, so report counts are not risk rates. Popular medicines get more reports.
• The FDA hides brand names in its public data. Reports are grouped by active ingredient(s); brands listed are examples of products containing them.
• Reactions use the FDA's VeDDRA terms, grouped into plain-English names (for example "emesis" and "vomiting" become Vomiting). Reports that a medicine didn't work are shown separately from side effects.
• "Typical onset" is the median time from first dose to first sign, where both dates were given.

PetMedCheck is not affiliated with the FDA or any drug manufacturer.