Understanding FDA Adverse Event Reporting (FAERS)

The FDA Adverse Event Reporting System (FAERS) is a database containing millions of reports of adverse drug events submitted by healthcare professionals, consumers, and manufacturers. It serves as the primary post-market surveillance tool for detecting safety signals that were not apparent during clinical trials. However, FAERS data has important limitations. Reports do not prove causation: a reported adverse event may be coincidental, related to the underlying disease, or caused by another drug the patient was taking.

Reporting is voluntary for consumers and healthcare professionals, meaning the database captures only a fraction of actual events. The FDA estimates that only 1-10% of adverse events are ever reported. Duplicate reports are common, as the same event may be submitted by the patient, doctor, and manufacturer separately. Despite these limitations, FAERS has been instrumental in identifying serious risks that led to drug withdrawals and label changes.

The FDA uses data mining algorithms to detect statistical signals, which trigger further investigation. The openFDA API makes FAERS data publicly accessible, enabling researchers and patients to search for reported events associated with specific drugs..