Which term describes all noxious and unintended responses to a medicinal product related to any dose?

• A. Adverse Event (AE)
• B. Adverse Drug Reaction (ADR)
• C. Applicable Regulatory Requirements
• D. Institutional Review Board Approval

Answer: (B)

Understanding how adverse events are categorized in clinical trials hinges on causality to the drug. An adverse drug reaction is a harmful, unintended response that is causally related to the medicinal product. This means the event is considered to be caused by the drug, typically at doses used in humans. That causal link is what makes ADR the best fit for “noxious and unintended responses related to any dose.”

In contrast, an adverse event is any untoward medical occurrence in a participant, regardless of whether it is related to the drug, so it includes events not caused by the treatment. The other options describe regulatory or ethical aspects rather than a drug-related event.