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WHO ATC/DDD Index

WHO Collaborating Centre for Drug Statistics Methodology

HDB-0078

The Anatomical Therapeutic Chemical (ATC) Classification System and Defined Daily Dose (DDD) system is maintained by the WHO Collaborating Centre for Drug Statistics Methodology hosted by the Norwegian Institute of Public Health. It provides an international standard system for classifying drugs and measuring medication usage in drug utilization research and monitoring.

Category

Terminology

Access

Free registration

Region

Global

License / terms

Public domain

Data types

drug classification, medication usage, pharmaceutical codes

drug classification ATC codes medication dosing drug utilization

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Record HDB-0078 · last verified 2026-08-05 · listed in Terminology & standards

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