Treatment Emergent Adverse Event [TEAE]

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Treatment emergent adverse events (TEAE) are undesirable events not present prior to medical treatment, or an already present event that worsens either in intensity or frequency following the treatment.

In medicines development terminology, an adverse event (AE) is any undesirable event that occurs after a participant officially consents to take part in a trial (and could occur before treatment begins). An adverse event may or may not be associated with the medicine under investigation, but must be documented because it happened during the trial period.

A treatment emergent adverse event (TEAE) is an adverse event that occurs only once treatment has started.