
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
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: 2022-05-05