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eCTD modules explained: the five-module structure

The eCTD is the electronic format for a medicine dossier sent to a regulator, and its modules are the five parts every dossier is split into. Module 1 holds regional administrative documents. Module 2 holds the summaries. Module 3 holds the quality data, Module 4 the nonclinical study reports and Module 5 the clinical study reports. The content of Modules 2 to 5 is the same in Europe, the United States and Japan. The electronic layer adds a fixed folder structure, file rules and an index that tracks every change across the life of the product.

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certificate and training record
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What is the eCTD modules structure?

The structure is defined in ICH M4, the guideline on the Common Technical Document. It looks like a triangle: detailed reports at the bottom, summaries in the middle, regional papers on top.

Module 1, regional administrative information. Application form, product information, regional documents. Not harmonised.
Module 2, summaries. The quality overall summary, the nonclinical overview and summaries, the clinical overview and summaries.
Module 3, quality. Section 3.2.S covers the drug substance and section 3.2.P the drug product: manufacture, controls, specifications, validation, stability.
Module 4, nonclinical study reports. Pharmacology and toxicology.
Module 5, clinical study reports. All clinical trials and their data.

What are the modules of eCTD used for after approval?

The dossier is never finished. Every variation, renewal and safety update is sent as a new sequence that adds, replaces or deletes documents in the same structure. The index keeps the history, so a regulator can see what the dossier said on any given date. This is why a messy first submission costs money for years: every later change has to work around it.

Why do eCTD submissions fail validation in the EU?

Before any scientist reads the dossier, it goes through technical validation against the EU validation criteria. Common failures are broken links and bookmarks, files that are not searchable, documents placed in the wrong section, wrong lifecycle operations, and missing Module 1 documents. A failed technical validation means the dossier is sent back before the clock starts.

How do eCTD modules affect a supplier selling into Europe?

A European marketing authorisation holder will ask its supplier for Module 3 documents in the right structure and quality. A supplier whose documents drop straight into 3.2.S or 3.2.P saves the customer weeks, and that is a selling point. The courses below teach the structure by role, with a recorded questionnaire at the end of each module.

This guide belongs to Training for Regulatory affairs in pharma: 227 audio courses, 227 courses.

Courses that teach this, priced per learner per year

Each course is audio modules in three lengths, with workbook, transcript, a recorded questionnaire per module, a certificate and the training record. Prices are the list price per learner for a year; the price falls with more learners.

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Questions about eCTD modules

What is the difference between CTD and eCTD?

The CTD is the content and its order, defined in ICH M4. The eCTD is the electronic way of sending it: fixed folders, PDF rules, and an XML backbone that tells the regulator which document is new, replaced or deleted in each sequence.

Is Module 1 the same everywhere?

No. Module 1 is regional. In the EU it holds the application form, product information in every language, and the regional documents. The United States and other regions use their own Module 1 specifications.

Which module does an API or excipient supplier contribute to?

Mostly Module 3. A supplier of an active substance provides the 3.2.S data, often through an Active Substance Master File or a certificate of suitability, and the quality overall summary in Module 2 refers to it.

What is eCTD v4.0?

The next version of the electronic standard, developed under ICH M8. It changes the technical backbone and how documents are reused across sequences. The modules and their content stay the same.

Who needs eCTD training?

Regulatory affairs staff who build and publish sequences, and the quality, production and laboratory staff who write the documents that go into Module 3. Most validation failures start with a document that was written without the format in mind.

Is the course certificate an eCTD certification?

The certificate records that a named person completed the course and its questionnaires, with hours, guideline version and date. It is evidence of training for your auditor. It is not a professional qualification or an accreditation.

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