= Anatomical Therapeutic Chemical (ATC) Codes These are a set of codes produced by the WHO used for classifying drugs by usage. == Resources * [[http://ec.europa.eu/health/documents/community-register/html/atc.htm | Categorised List]] * [[http://www.whocc.no/atc_ddd_index/ | Searchable Database]] An Excel sheet of the codes can be downloaded from [[http://wido.de/amtl_atc-code.html | here]], but it's in German. Can't find a version in English.