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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. |
| Anatomical Therapeutic Chemical Classification System - Wikipedia, the free encyclopedia (314 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 fifth level of the code is based on the chemical substance subgroup and consists of two digits. |
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