Working groups

Expert Working Group on MedDRA Labelling Groupings

On 8 August 2022, the Working Group published an article entitled “MedDRA Labeling Groupings to Improve Safety Communication in Product Labels” in the Journal Therapeutic Innovation & Regulatory Science.
Download it here.
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Working Group milestones

At the September 2018 MedDRA SMQ Working Group meeting, participants discussed the concept of MedDRA Labelling Groupings (MLGs) for use in reference safety information (minutes). A concept paper and a more concise one-pager were then submitted to the ICH MedDRA Management Committee for consideration and received their green light for further exploration.

The MLG concept was also presented at the 18th Annual meeting of the International Society of Pharmacovigilance (ISoP), held in Geneva on 11-14 November 2018. Click here for details of the session and the presentations.

The MedDRA Labelling Groupings idea was presented and received with great interest in San Diego at the DIA 2019 conference on 25-26 June 2019:

MedDRA Labeling Groupings

Report of the Expert Working Group on MedDRA Labeling Groupings published in March 2024


Although the established Medical Dictionary for Regulatory Activities (MedDRA) hierarchy provides groupings of related and meaningful medical concepts, these groupings can be of a broader scope, beyond the medical concepts intended for the label. Other types of groupings may also be needed to appropriately cluster individual MedDRA terms that convey the same clinical concept, thus supporting clearer communication. To this effect, several organizations have already independently created their own groups of medically related terms.

Concept note one pager

Full concept note

Working Group objectives

It is proposed that globally harmonized principles, points to consider, and pragmatic recommendations for development of MedDRA Labelling Groupings (MLGs) be developed by a Council for International Organizations of Medical Sciences (CIOMS) working group. The desired outcome is an international approach which would be available for voluntary consideration.


1st meeting held on 3-4 April 2019, Geneva, Switzerland (minutes)

2nd meeting held on 25-26 September 2019, Geneva, Switzerland (minutes)

3rd meeting held virtually on 25-26 August 2020 (minutes)

4th meeting held virtually on 4 March 2021 (minutes)

5th meeting held virtually on 8 December 2021 (minutes)

6th meeting held virtually on 20 June 2023 (minutes)

Working Group Members log in here for working documents.


Upcoming Meetings

29 - 30 October 2024

Geneva, Switzerland

9th Meeting of the Working Group on Education and Training for Health Professionals

24 - 25 September 2024

Darmstadt, Germany

9th Meeting of the Working Group on Artificial Intelligence in Pharmacovigilance

25 June 2024


CIOMS General Assembly 2024

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