What an adverse-event report means

A report describes a concern

An adverse-event report records a concern reported after a medicine was used. Read it as an account of what was reported, rather than a finding about what caused the problem. The order of events matters when describing an experience, but an event happening after treatment does not establish that the treatment caused it.

On this site, wording such as “signs reported after an ingredient” keeps that distinction visible. It describes the report context without assigning blame to the ingredient. If you are reading because something changed in your own pet, contact your veterinarian to discuss what you observed.

Missing details limit the picture

A report may not contain every detail you would want when thinking about your dog or cat. Do not assume that information missing from the public data was absent from the pet’s life. A gap is a gap, rather than evidence that there were no other relevant circumstances.

Brand names are masked in FDA’s public report data. That means you cannot use the public report data to identify a brand by guessing from an ingredient name. FDA approves animal drugs and lists them in the Green Book, but Green Book product names and public report records answer different questions. A product listing does not assign reports to that product.

Counts depend on use and reporting

A report count depends on use and reporting. It is not a measure of how likely your pet is to experience a problem. It also cannot tell you how medicines would compare if they were used in the same circumstances.

Do not rank products by their report counts or treat a count as a reason to choose a treatment. Reports do not prove cause, and counts cannot estimate risk or compare products. The site’s data source explanation provides context for reading the ingredient and sign pages.

Reports and recalls answer different questions

A report count is not a recall notice. For a recall question, read the actual notice on the recall pages. A recall notice names products, lot numbers and dates, so check the lot code on your package against the notice. Do not try to infer a recall from a report count.

Bring your questions to your veterinarian

Talk to your veterinarian before starting, stopping or changing a medicine. Bring the label, your questions and notes about any signs you noticed. Describe the timing and what happened without assuming a cause. If your pet has an emergency, call your veterinarian or an emergency clinic.

To submit an animal drug concern, follow FDA’s reporting instructions, use FDA Form 1932a, or contact the drug company at the phone number on the label.