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- ATC/DDD Methodology Questionnaire: We Need Your Input!
We kindly invite you to participate in a WHO-led questionnaire focused on the implementation and usage of the ATC/DDD methodology. Your insights will help improve the system and shape future developments. It should take approximately 20 minutes to complete the questionnaire. Responses are requested...
- Use of ATC/DDD
Implementation and maintenance of the ATC/DDD methodologyWhen the decision to introduce and use the ATC/DDD methodology is taken, it is essential to realize that its proper use inevitably includes an important and time-consuming first step: Each pharmaceutical product has to be linked to the...
- Meetings/open session
Working Group meetingsThe WHO International Working Group for Drug Statistics Methodology meets...
- Contact the WHO Collaborating Centre for Drug Statistics Methodology
Telephone: + 47 21 07 81 60E-mail: whocc@fhi.no Visiting address/courier address:Myrens verksted 6HBygg C0473 OsloMap Mail address:Norwegian Institute of Public HealthWHO Collaborating Centre for Drug Statistics MethodologyP.O.Box 222 SkøyenN-0213 OsloNorway
- ATC/DDD request submission
All ATC/DDD-related requests should be submitted electronically here. This applies to requests for: New ATC codes New DDDs Alterations Objections to temporary decisions of the WHO Advisory Group for Drug Statistics Methodology that are open for comments/objections (see current list and...
- ATCvet meeting 2024
Documents to the ATCvet meeting in Oslo November 2023
Agenda Point 4_ https://atcddd.fhi.no/filearchive/expert_group/point_4__atcvet_new_and_alterations 2025.xlsxPoint 5 New ATCvet codesPoint 5 Supplementary to ATCvet codesPoint 6 LubabegronPoint 7 RactopaminePoint 8 BluetonguevirusInformation - how to get to FHI
- ATC Index with DDDs
The WHO Collaborating Centre for Drug Statistics Methodology publishes an updated version of the complete ATC index with DDDs annually. The ATC index is available in electronic format (Excel or XML) and can be downloaded from a registered user account. Access is provided via the ordering portal...
- Structure and principles
Structure In the ATC classification system, the active substances are classified in a hierarchy with five different levels. The system has fourteen main anatomical/pharmacological groups or 1st levels. Each ATC main group is divided into 2nd levels which could be either pharmacological or...
- Practical information
VenueNorwegian Institute of Public Health, Myrens verksted 6H, 0473 Oslo, Norway. Details on how to reach us will be sent to all participants. DatesThis is a 2-full-day (from 9.00 to 16.30) course and will be held on 26 and 27 November 2026. LanguageEnglish. Participation fee€ 450,-. ...
- Guidelines for ATC classification and DDD assignment
The guidelines describe the ATC classification system and the DDD methodology. The publication consists of a general part with information about the system and procedures and data requirements for ATC/DDD assignment and alterations. The second part of the publication, the interpretative guidelines,...
- WHO Collaborating Centre for Drug Statistics Methodology
The Centre was established in 1982. The Centre is located in Oslo at the Norwegian Institute of Public Health and funded by the Norwegian government. The Centre's main activities are development and maintenance of the ATC/DDD system, including: To classify drugs according to the ATC system. To...
- ATCvet index
The WHO Collaborating Centre for Drug Statistics Methodology publishes a new issue of the complete ATCvet Index annually. The complete ATCvet Index consists of one list sorted according to ATCvet codes, listing all the ATCvet codes established. The ATCvet Index is available in electronic format and...
Last updated: 2026-07-16

