Medical Dictionary for Regulatory Activities Terminology (MedDRA)

Last uploaded: March 22, 2026

Details

Acronym	MEDDRA
Visibility	Public
Description	MedDRA is an international medical terminology with an emphasis on use for data entry, retrieval, analysis, and display. It applies to all phases of drug development, excluding animal toxicology, and to the health effects and malfunction of devices. An appendix includes concept descriptions which describe how a medical concept is interpreted, used, and classified within the MedDRA terminology. It is not intended as a medical definition. The concept descriptions are intended to aid the consistent and accurate use of MedDRA in coding, retrieval, and analysis.
Status	Production
Format	UMLS
Categories	Health
Groups	Unified Medical Language System
License Information	The MedDRA ontology is maintained and distributed by the MedDRA MSSO. This ontology is freely accessible on this site for academic and other non-commercial uses. Users anticipating any commercial use of MedDRA must contact the MSSO to obtain a license.

Alternative name	MDR See more...
Bibliographic reference	https://www.meddra.org/msso-presentations https://www.meddra.org/msso-presentations
Contact	Med Dra Msso ([email protected])
Creation date	November 3, 2025
Deprecated	false See more...
Documentation	https://www.meddra.org/how-to-use/support-documentation See more...
Homepage	https://www.meddra.org/ See more...
Imports	http://www.w3.org/2004/02/skos/core http://www.w3.org/2004/02/skos/core
Notes	RDF Version of the UMLS ontology MDR; converted with the UMLS2RDF tool (https://github.com/ncbo/umls2rdf), developed by the NCBO project. See more...
Object creation date property	http://purl.org/dc/elements/1.1/created http://purl.org/dc/elements/1.1/created
Object modification date property	http://purl.org/dc/elements/1.1/modified http://purl.org/dc/elements/1.1/modified
Source	UMLS 2025AB See more...
Submission date	March 22, 2026
Syntax	http://www.w3.org/ns/formats/Turtle http://www.w3.org/ns/formats/Turtle
Version information	28.0 See more...
uri	http://purl.bioontology.org/ontology/MEDDRA/ http://purl.bioontology.org/ontology/MEDDRA/

Version	Released	Uploaded
28.0 (Parsed, Indexed, Metrics, Annotator, Error Diff)	11/03/2025	03/22/2026
27.1 (Archived)	05/06/2025	03/19/2026
MDR27_0 (Archived)	11/04/2024	01/16/2025
2024AA (Archived)	05/06/2024	08/28/2024
2023AB (Archived)	11/06/2023	01/31/2024
2023AA (Archived)	04/01/2023	08/07/2023
2022AB (Archived)	11/07/2022	01/06/2023
2022AA (Archived)	05/02/2022	06/10/2022
2021AB (Archived)	11/01/2021	11/18/2021
2021AA (Archived)	04/03/2021	05/20/2021
2020AB (Archived)	11/02/2020	01/06/2021
2020AA (Archived)	05/05/2020	09/24/2020
2019AB (Archived)	11/04/2019	11/18/2019
2019AA (Archived)	05/06/2019	08/27/2019
2018AB (Archived)	11/05/2018	04/29/2019
2018AA (Archived)	05/07/2018	07/06/2018
2017AB (Archived)	11/06/2017	07/06/2018
2017AA (Archived)	05/08/2017	04/06/2018
2016AB (Archived)	02/06/2017	02/06/2017
2016AA (Archived)	09/06/2016	09/06/2016
2015AB (Archived)	07/20/2016	07/20/2016
2015AA (Archived)	06/09/2015	06/09/2015
2014AB (Archived)	01/29/2015	01/29/2015
2014AA (Archived)	05/28/2014	05/28/2014
2013AB (Archived)	02/18/2014	02/18/2014
2013AA (Archived)	01/14/2014	01/14/2014
2013AA (Archived)	05/08/2013	09/25/2013
more...

MedDRA French: This is the French translation of the Medical Dictionary for Regulatory Activities (MedDRA).
MedDRA German: This is the German translation of the Medical Dictionary for Regulatory Activities (MedDRA).

Classes	82,908
Individuals	0
Properties	13
Maximum depth	7
Maximum number of children	0
Average number of children	0
Classes with a single child	0
Classes with more than 25 children	0
Classes with no definition	82,678