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
New ATC/DDDs and alterations from the 2 April 2020 meeting
Updates of the list of DDDs for combined products
The meeting of the WHO International Working Group of Drug Statistics Methodology 19 March 2020 has been postponed
Course in ATC/DDD - postponed
Updates of the list of DDDs for combined products
Last updated: 2020-08-17