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Anatomical Therapeutic Chemical (ATC) Classification System (381 words) |
 | ATC classifications are available online, and are updated and published once a year by the World Health Organization Collaborating Centre for Drug Statistics Methodology (http://www.whocc.no/atcddd/). |
 | The ATC system and its associated Defined Daily Dose as a measuring unit are recommended by the WHO for drug utilization studies. |
 | In the ATC 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. |
| Britain.tv Wikipedia - ATC code (298 words) |
 | The third level of the code is based on the therapeutic/pharmacological subgroup and consists of one letter. |
 | The fourth level of the code is based on the chemical/therapeutic/pharmacological subgroup and consists of one letter. |
 | The ATC/DDD system is the ATC system with the addition of a measure of the assumed average maintenance dose per day for a drug used for its main indication in adults (Defined Daily Doses). |