= 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 Excell sheet of the codes can be downloaded from here: [[http://wido.de/amtl_atc-code.html]]