Adverse Event Reporting System

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About the Adverse Event Reporting System


The Adverse Event Reporting System (AERS) is a computerized information database designed to support the FDA's post-marketing safety surveillance program for all approved drug and therapeutic biologic products. The Food and Drug Administration (FDA) uses AERS to monitor for new adverse events and medication errors that might occur with these marketed products.

Reporting of adverse events from the point of care is voluntary in the United States. FDA receives some adverse event and medication error reports directly from health care professionals (such as physicians, pharmacists, nurses and others) and consumers (such as patients, family members, lawyers and others). Healthcare professionals and consumers may also report these events to the products’ manufacturers. If a manufacturer receives an adverse event report, it is required to send the report to FDA as specified by regulations.

AERS data do have limitations. First, there is no certainty that the reported event was actually due to the product. FDA does not require that a causal relationship between a product and event be proven, and reports do not always contain enough detail to properly evaluate an event. Further, FDA does not receive all adverse event reports that occur with a product. Many factors can influence whether or not an event will be reported, such as the time a product has been marketed and publicity about an event. Therefore, AERS cannot be used to calculate the incidence of an adverse event in the U.S. population.

Access the Data

See the US FDA's website for Adverse Event Reports:


The AERS reports are updated quarterly and available for download. Each AERS report includes:

  • demographic and administrative information and the initial report image ID number (if available);
  • drug information from the case reports;
  • reaction information from the reports;
  • patient outcome information from the reports;
  • information on the source of the reports;
  • a "README" file containing a description of the files.