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
Updates of the list of DDDs for combined products
Proposed new classification for L01XE Protein kinase inhibitors and L01XX Other antineoplastic agents
New ATC/DDD included in the index of 2020
New ATC/DDDs and alterations from the October 2019 meeting
List of DDDs for three years revision
Last updated: 2019-12-05