Postal address:
WHO Collaborating Centre for Drug Statistics Methodology
Norwegian Institute of Public Health
Postboks 222 Sk°yen
0213 Oslo

Visiting/delivery address:
Sandakerveien 24C
Bygg C
0473 Oslo

Tel:  +47 21 07 81 60

About the course

How to classify drugs and measure drug consumption - Course in the ATC/DDD methodology

The course introduces the Anatomical Therapeutic Chemical (ATC) classification system and the technical unit of measurement, the Defined Daily Dose (DDD). Applications of the ATC/DDD methodology will be presented and discussed.

Both lectures and working group sessions will be included.  The lectures will cover the following topics:

  • Background, overview and development of the ATC/DDD methodology
  • The main principles for establishing new ATC codes and assigning DDDs
  • ATC codes and DDDs for fixed combinations
  • Procedures for applications (ATC codes, DDDs and changes

The second day will focus on applying the ATC/DDD methodology in drug consumption statistics; practical examples will be included. Other applications of the methodology will also be presented.

The working group sessions are essential elements of the course. Various ATC/DDD problems and points to consider related to the application of the methodology in drug consumption statistics will be discussed.

Background knowledge: The course is open to all interested parties. However, basic knowledge of common medical terminology is recommended. The course will be conducted in English.

WHO Collaborating Centre for Drug Statistics Methodology
The course is arranged by the WHO Collaborating Centre for Drug Statistics Methodology, which is situated at the Norwegian Institute of Public Health in Oslo. The Centre is responsible for developing and updating the ATC/DDD system. New drugs are classified and DDDs are assigned by the Centre in cooperation with the WHO International Working Group for Drug Statistics Methodology. This Working Group includes international experts in clinical pharmacology and medicine, global public health, drug regulation and drug utilisation. An expert from the Working Group will participate as lecturer on the course.

Last updated: 2022-03-02