What is an Adverse Event?

An adverse event (AE) is any untoward medical occurrence in a clinical trial participant who has received a pharmaceutical product, regardless of whether it is considered related to the study treatment. It may include symptoms, diseases, abnormal laboratory findings, or injuries observed during the study period.

In clinical trials, adverse events (AEs) are used to continuously monitor the safety and well-being of study participants. They are identified at investigator sites during scheduled visits, physical examinations, laboratory tests, and through unsolicited reports from participants. All observed or reported AEs are systematically documented in the case report form (CRF) to ensure consistent and complete data capture across study sites.

Clinion implements adverse event management by providing structured electronic case report forms (eCRFs) that enable investigators to accurately capture, update, and track AEs throughout the clinical trial. The system supports standardized classification of events, assessment of severity and causality, and linkage to study visits and subjects. Built-in validations and audit trails help maintain data consistency and traceability, while centralized access allows sponsors and safety teams to review AE data in real time for ongoing safety oversight.

Data accuracy and traceability are protected through complete audit trails, real-time edit checks, validations, and query management, capturing every change with user, date, and reason. By integrating EDC, eSource, ePRO, and eConsent, Clinion minimizes manual data handling, helping maintain accurate, consistent, and inspection-ready data throughout the trial.

In practice, Adverse Event (AE) management in clinical trials is reflected through structured documentation within the eCRF for each participant. When an AE occurs, investigators record details such as onset, duration, severity, seriousness, and relationship to the study treatment. These adverse events in clinical trials are updated over time, tracked across visits, and reviewed by study teams to ensure timely safety assessment and regulatory compliance.

The recorded AE data is reviewed by investigators, sponsors, and safety monitoring teams to assess severity, seriousness, causality, and outcomes. This evaluation supports ongoing risk–benefit assessment of the investigational product, enables timely regulatory reporting, and informs decisions such as protocol amendments, dose modifications, or study continuation.

MedDRA

Medical Coding

Safety Reporting

Serious Adverse Event

Concomitant Medication

AI-Native Electronic Data Capture (EDC) Software for Clinical Trials
Taking Medical Coding to the Next Level with AI and Machine Learning
What Is Clinical Data Management? Key Concepts Explained

EDC & Data Management