The Anatomical, Therapeutic, Chemical Classification System with Defined Daily Doses (ATC/DDD)
Identifying and definitional attributes
In the ATC/DDD classification system, drugs are divided into different groups according to the organ or system on which they act and their chemical, pharmacological and therapeutic properties.
Drugs are classified into five different levels. Drug consumption statistics (international and other levels) can be presented for each of these five levels.
Collection and usage attributes
The Anatomical therapeutic classification (AT) was developed by the European Pharmaceutical Market Research Association (EPhMRA). The ATC/DDD system and the AT classification have the same origin, but are developed for different purposes. Comparative tables are available.
The ATC classification used the International Nonproprietary Name (INN) whenever possible.
Source and reference attributes
The Guidelines for ATC classification and DDD assignment were published for the first time in the current format in 1990. The Guidelines are published in all 3 languages in paper format only.
The Index was published as a paper copy in the current format in 1990 for the first time. The Index is published in the following languages and formats: English (all available indexes), German (paper version only), Spanish (paper version only).
An online searchable database is also available at http://www.whocc.no/atcddd/.
The system has been used for statistics since 1975.
Years between revisions - 1
Year of last revision - 2004
Latest revision number - 6 for the Guidelines in the current format, 13 for the Index in the current format.
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