Anatomical Therapeutic Chemical Classification

The Anatomical Therapeutic Chemical (ATC) Classification System is used for the classification of active ingredients of drugs according to the organ or system on which they act and their therapeutic, pharmacological and chemical properties. It is controlled by the World Health Organization Collaborating Centre for Drug Statistics Methodology (WHOCC), and was first published in 1976.

Ontology info

Ontology id: atc
Version: 2018ab
Number of terms: 8404
Last loaded: Mon Mar 16 16:00:34 CET 2020


RDF Version of the UMLS ontology ATC; converted with the UMLS2RDF tool (, developed by the NCBO project.