Expectedness — Listed vs. Unlisted

Expectedness answers a question that’s genuinely separate from both causality ("did the drug cause it?") and seriousness ("was it serious enough to matter?"): is this event already documented as a known effect of the drug? An event can be all three at once — serious, causally related, and fully expected — which is worth internalising early, because it’s easy to assume "unexpected" is a synonym for "surprising," when it’s actually a defined technical comparison against a specific reference document.

That reference document is the Company Core Safety Information (CCSI) — the company’s master reference listing of known adverse reactions for the product, from which local product labels are derived. An event is "expected" (or "listed") when its nature, severity, and specificity are all consistent with what’s already documented in the CCSI. Note the three separate dimensions: nature (is it the same type of event), severity (is it a comparably severe manifestation), and specificity (is it described at a comparable level of detail).

That last point is where a lot of expectedness assessments actually turn. A drug’s label might list "elevated liver enzymes" as a known, mild, monitorable effect. A case reporting fulminant hepatic failure requiring a liver transplant involves the same organ system, but it is not the same event by severity or specificity — it’s a dramatically more severe manifestation than what’s listed, and it gets classified as unexpected precisely because the listed information didn’t adequately warn of this magnitude of risk. This is a common and consequential source of confusion: assessors sometimes reason "the liver is mentioned in the label, so this is expected," which misses the severity and specificity components entirely.

This matters enormously in practice because expectedness is one of the three conditions — alongside suspected causality and seriousness — that together define a SUSAR, the case type that triggers the tightest expedited reporting timelines covered in Module 1. And because listedness is assessed against a specific reference document, and different jurisdictions can require assessment against slightly different versions of the label, the same case can technically be "expected" in one region and "unexpected" in another — which is exactly why global companies maintain a single CCSI as the master reference and map local expectedness determinations against the locally applicable document for each regulatory submission.