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WHO Collaborating Centre for Drug Statistics Methodology

The Anatomical Therapeutic Chemical (ATC) classification system and the Defined Daily Dose (DDD) is the gold standard measuring unit for exchanging and comparing data on drug use at international, national or local levels.

Order ATC/DDD Index for 2025
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Order ATC/DDD Index for 2025

Available as downloadable files, .xlsx or .xlm, or paper versions upon registration and login

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Contact information

Postal address
Norwegian Institute of Public Health
WHO Collaborating Centre for Drug Statistics Methodology
P.O.Box 222 Skøyen
N-0213 Oslo
Norway

Visiting address
Myrens verksted 6H
Bygg C
0473 Oslo