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From Wikipedia, the free encyclopedia
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The Anatomical Therapeutic Chemical (ATC) Classification System is used for the classification of active ingredients of drugs according to the organ or system on which they act and their therapeutic, pharmacological and chemical properties. It is controlled by the World Health Organization Collaborating Centre for Drug Statistics Methodology (WHOCC), and was first published in 1976.[1]

This pharmaceutical coding system divides drugs into different groups according to the organ or system on which they act and/or their therapeutic and chemical characteristics. Each bottom-level ATC code stands for a pharmaceutically used substance, or a combination of substances, in a single indication (or use). This means that one drug can have more than one code: acetylsalicylic acid (aspirin), for example, has A01AD05 as a drug for local oral treatment, B01AC06 as a platelet inhibitor, and N02BA01 as an analgesic and antipyretic. On the other hand, several different brands share the same code if they have the same active substance and indications.

Classification[edit]

In this system, drugs are classified into groups at 5 different levels:[2]

First level[edit]

The first level of the code indicates the anatomical main group and consists of one letter. There are 14 main groups:[3]

Code Contents
A Alimentary tract and metabolism
B Blood and blood forming organs
C Cardiovascular system
D Dermatologicals
G Genito-urinary system and sex hormones
H Systemic hormonal preparations, excluding sex hormones and insulins
J Antiinfectives for systemic use
L Antineoplastic and immunomodulating agents
M Musculo-skeletal system
N Nervous system
P Antiparasitic products, insecticides and repellents
R Respiratory system
S Sensory organs
V Various

Example: C Cardiovascular system

Second level[edit]

The second level of the code indicates the therapeutic main group and consists of two digits.

Example: C03 Diuretics

Third level[edit]

The third level of the code indicates the therapeutic/pharmacological subgroup and consists of one letter.

Example: C03C High-ceiling diuretics

Fourth level[edit]

The fourth level of the code indicates the chemical/therapeutic/pharmacological subgroup and consists of one letter.

Example: C03CA Sulfonamides

Fifth level[edit]

The fifth level of the code indicates the chemical substance and consists of two digits.

Example: C03CA01 Furosemide

ATCvet[edit]

The Anatomical Therapeutic Chemical Classification System for veterinary medicinal products (ATCvet) is used to classify veterinary drugs. ATCvet codes can be created by placing the letter Q in front of the ATC code of most human medications. For example, furosemide for veterinary use has the code QC03CA01.

Some codes are used exclusively for veterinary drugs, such as QI Immunologicals, QJ51 Antibacterials for intramammary use or QN05AX90 amperozide.[4]

Defined daily dose[edit]

Main article: Defined daily dose

The ATC system also includes defined daily doses (DDDs) for many drugs. This is a measurement of drug consumption based on the usual daily dose for a given drug. According to the definition, "[t]he DDD is the assumed average maintenance dose per day for a drug used for its main indication in adults."[5]

Purpose[edit]

National adaptations[edit]

National issues of the ATC classification, such as the German Anatomisch-therapeutisch-chemische Klassifikation mit Tagesdosen, may include additional codes and DDDs not present in the WHO version.[6]

See also[edit]

References[edit]

  1. ^ "ATC/DDD Methodology: History". WHO Collaborating Centre for Drug Statistics Methodology. 
  2. ^ "ATC: Structure and principles". WHO Collaborating Centre for Drug Statistics Methodology. 
  3. ^ "ATC/DDD Index". WHO Collaborating Centre for Drug Statistics Methodology. 
  4. ^ "ATCvet classification system: General principles". WHO Collaborating Centre for Drug Statistics Methodology. 
  5. ^ "DDD: Definition and general considerations". WHO Collaborating Centre for Drug Statistics Methodology. 
  6. ^ "ATC-Klassifikation mit DDD: Gesetzlicher Hintergrund" (in German). Deutsches Institut für Medizinische Dokumentation und Information. 

External links[edit]

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