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The Interventions general observational class of domains is used  to represent investigational, therapeutic, and other treatmentsproducts that are administered to the subject (with some actual or expected physiological effect) either as specified by the study protocol (e.g., exposure to study product  coincident with the study assessment period (e.g., concomitant medications), or self‑administered by the subject (e.g., use of alcohol, tobacco, or caffeine).

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Several examples are provided below to illustrate the different ways the subjectsa subject's history of recreational product usage may be collected in studies. Note, that the Findings About Events or Interventions structure (or "FA structure") is used to represent collected data that are findings about” an event or intervention that cannot be represented within an event or intervention record or as a supplemental qualifier to such a record. Not all findings associated with an event or intervention should be represented in the FA structure.

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