The ICH E2 Series — The Technical Backbone

The International Council for Harmonisation (ICH) unites regulators and industry from the EU, US, Japan, and other regions to harmonise scientific and technical requirements for drug development and safety reporting. The ICH E2 series defines every core aspect of PV data management — and forms the backbone that lets a company report safety data in one format that every major regulator can read.

E2A is the foundational document: it defines Adverse Event, Adverse Drug Reaction, Serious Adverse Event, and Suspected Unexpected Serious Adverse Reaction — terminology that is identical at FDA, EMA, CDSCO, and PMDA — and sets the 7-day and 15-day expedited SUSAR reporting clocks. E2B(R3) defines the XML structure every major safety database (Argus, LifeSphere, Vault Safety) generates and receives; the shift from R2 to R3 was a multi-year industry-wide implementation completed between 2014 and 2020.

E2C(R2) replaced the legacy PSUR with the PBRER — an integrated benefit-risk evaluation rather than a simple adverse-event catalogue, covered in full in Chapter 11. E2D extends the data sources that must be monitored post-approval to spontaneous reports, literature, and observational studies. E2E introduces proactive PV planning before approval — identifying known risks, potential risks, and information gaps that feed directly into the Risk Management Plan. E2F defines the DSUR, the annual aggregate safety report that runs from a product’s Development International Birth Date until marketing authorisation.

It helps to see the E2 series as a single pipeline rather than six unrelated documents: E2E plans what to watch for before a drug is even approved, E2A/E2B(R3) define and transmit what gets found, E2D widens the net once the drug is marketed, and E2C(R2)/E2F periodically roll everything up into aggregate reports for regulators. A PV professional moving between a CRO’s clinical-trial safety desk and a company’s post-marketing team is really just moving along different points of this same pipeline — which is why fluency in the full E2 series, not just the piece you work in daily, is what separates a generalist from someone who still needs hand-holding on a new project.