Anatomical Therapeutic Chemical Classification System
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Overview
The Anatomical Therapeutic Chemical Classification System is used for the classification of drugs. It is controlled by the WHO Collaborating Centre for Drug Statistics Methodology, and was first published in 1976.
The classification system divides drugs into different groups according to the organ or system on which they act and/or their therapeutic and chemical characteristics.
Classification
In this system, drugs are classified into groups at 5 different levels:
First level
The first level of the code is based on a letter for the anatomical group and consists of one letter; there are 14 main groups:
Second level
The second level of the code is based on the therapeutic main group and consists of two digits.
Third level
The third level of the code is based on the therapeutic/pharmacological subgroup and consists of one letter.
Fourth level
The fourth level of the code is based on the chemical/therapeutic/pharmacological subgroup and consists of one letter.
Fifth level
The fifth level of the code is based on the chemical substance subgroup and consists of two digits.
External links
- [3] Official ATC website, hosted by the WHO Collaborating Centre for Drug Statistics Methodology
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Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
