A simplified version of the CTD, designed for ASEAN member countries to harmonize submissions within the region.

ACTR: The ASEAN Common Technical Requirements, which provide detailed guidance on dossier content.

Module 1: Always region-specific in both ACTD and CTD, containing administrative and country-specific information.

These definitions establish the foundation for understanding dossier preparation in different markets. While the CTD emphasizes global harmonization, the ACTD prioritizes practical implementation within the ASEAN context.

Structural Comparison of ACTD vs CTD

One of the key differences lies in dossier structure:

• CTD: Five modules:
  1. Module 1 – Regional Administrative Information
  2. Module 2 – Summaries
  3. Module 3 – Quality
  4. Module 4 – Nonclinical Study Reports
  5. Module 5 – Clinical Study Reports
• ACTD: Four parts:
  1. Part I – Administrative and Product Information
  2. Part II – Quality Document
  3. Part III – Nonclinical Document
  4. Part IV – Clinical Document

While the CTD includes a detailed Module 2 for summaries, ACTD integrates summaries within respective sections. This difference impacts dossier authoring, granularity, and submission preparation. Companies transitioning between CTD and ACTD must adapt documentation accordingly.

Country-Specific or Regional Variations

Regional variations between ACTD and CTD formats highlight distinct compliance considerations:

• CTD: Adopted in ICH regions (US, EU, Japan) and recognized in more than 100 countries globally. Module 1 varies by country but Modules 2–5 remain harmonized.
• ACTD: Mandatory in ASEAN member states such as Indonesia, Malaysia, Philippines, Singapore, Thailand, and Vietnam. Administrative requirements (Part I) vary by country.
• Language Requirements: ASEAN countries often require dossiers in local languages, while CTD submissions to ICH agencies are typically in English.
• Complexity: CTD requires greater detail and granularity, while ACTD provides a simplified dossier suitable for resource-limited agencies.

These variations underline the importance of customizing dossier strategies for each market. A “one-size-fits-all” approach is not practical when navigating both global and ASEAN submissions.

Processes, Workflow, and Submissions

The compilation workflow for ACTD vs CTD submissions differs slightly:

1. CTD Workflow: Prepare documents by module, author summaries (QOS, clinical summaries), format using eCTD publishing tools, validate, and submit via electronic gateways (FDA ESG, EMA CESP).
2. ACTD Workflow: Prepare documents by part, integrate summaries into sections, and submit electronically or in hard copy depending on the ASEAN authority’s requirements.
3. Bridging Strategies: Companies often adapt CTD dossiers into ACTD by removing Module 2 summaries and restructuring modules into four ACTD parts.

Understanding these workflows ensures efficiency, reduces duplication, and prevents delays caused by mismatched dossier formats.

Tools, Software, or Templates Used

Both ACTD and CTD submissions require specialized tools and templates:

• CTD Tools: eCTD publishing platforms like Lorenz docuBridge and Extedo eCTDmanager, plus FDA/EMA validation tools.
• ACTD Tools: While eCTD adoption in ASEAN is growing, many countries still accept PDF or paper-based ACTD submissions.
• Templates: Microsoft Word or XML-based templates tailored to ACTD/CTD structures for consistency and compliance.
• Document Management Systems (DMS): Tools like Veeva Vault or MasterControl for version control and collaboration.

Companies preparing for both ACTD and CTD submissions often maintain dual template libraries to streamline adaptation between formats.

Common Challenges and Best Practices

Regulatory professionals face unique challenges when working across ACTD and CTD formats:

• Redundancy: Preparing separate dossiers for ACTD and CTD can be resource-intensive.
• Inconsistencies: Maintaining content consistency between ACTD and CTD dossiers is challenging when data is updated.
• Validation: CTD submissions undergo strict technical validation, while ACTD submissions may lack automated checks, leading to manual errors.
• Language Barriers: ASEAN dossiers often require translations that can slow submissions.

Best practices include maintaining a master CTD dossier, using modular templates for easier adaptation, employing professional translators for ASEAN submissions, and conducting internal consistency reviews before submission.

Latest Updates and Strategic Insights

By 2025, several developments are shaping the ACTD vs CTD landscape:

• Digital Transformation: ASEAN countries are moving toward eCTD, reducing reliance on paper dossiers.
• Global Harmonization: WHO and ICH are encouraging harmonization between CTD and ACTD frameworks.
• Reliance Pathways: ASEAN regulators increasingly rely on FDA/EMA-approved dossiers, simplifying ACTD adaptations.
• Hybrid Submissions: Companies increasingly prepare hybrid dossiers that can be flexibly reformatted between ACTD and CTD.

Strategically, companies should view ACTD and CTD as complementary frameworks. Preparing a global CTD “core dossier” and customizing for ACTD requirements ensures efficiency and regulatory compliance. This dual strategy supports faster approvals and facilitates access to both developed and emerging markets.