What is ATC Classification system ?

What is ATC ?

The Anatomical Therapeutic Chemical (ATC) Classification System is a drug classification system that classifies the active ingredients of drugs according to the organ or system on which they act and their therapeutic, pharmacological and chemical properties.The classification system is maintained by the World Health Organization (WHO).

This pharmaceutical coding system divides drugs into different groups according to the organ or system on which they act, their therapeutic intent or nature, and the drug's chemical characteristics. 

Different brands share the same code if they have the same active substance and indications. 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, for example acetylsalicylic acid (aspirin) has A01AD05 as a drug for local oral treatment, B01AC06  as a platelet inhibitor, and N02BA01 as an analgesic and antipyretic; 

as well as one code can represent more than one active ingredient, for example C09BB04 is the combination of perindopril with amlodipine, two active ingredients that have their own codes (C09AA04  and C08CA01 respectively) when prescribed alone.

The ATC classification system is a strict hierarchy, meaning that each code necessarily has one and only one parent code, except for the 14 codes at the topmost level which have no parents. 

The codes are semantic identifiers, meaning they depict information by themselves beyond serving as identifiers (namely, the codes depict themselves the complete lineage of parenthood). As of 7 May 2020, there are 6,331 codes in ATC; the table below gives the count per level.

ATC levelCodesDifferent names/pharmaceuticals
Level 11414
Level 29494
Level 3267262
Level 4889819
Level 550674363






Reference:
https://en.wikipedia.org/wiki/Anatomical_Therapeutic_Chemical_Classification_System

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