
International language for drug utilization research
The Anatomical Therapeutic Chemical (ATC) classification system and the Defined Daily Dose (DDD) as a measuring unit have become the gold standard for international drug utilization monitoring and research.
The ATC/DDD system is a tool for exchanging and comparing data on drug use at international, national or local levels.
Welcome to the WHO Collaborating Centre for Drug Statistics Methodology
The WHO Collaborating Centre for Drug Statistics Methodology will be closed between 14 July 2022 and 1 August 2022 due to summer holidays.
News
Public consultation: New classification of L04A Immunosuppressants
New DDDs for combinations products
Temporary ATC/DDDs including alterations from the March 2022 meeting
New DDDs for combinations products
Temporary ATC/DDDs including alterations from the October 2021 meeting
Last updated: 2022-07-14