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Overview

ATC Classification System

The ATC (Anatomical Therapeutic Chemical) Classification System is an international classification system for drugs developed and maintained by the World Health Organization (WHO). It classifies the active ingredients of drugs based on the organ or system on which they act (anatomical), as well as their therapeutic, pharmacological, and chemical properties, using a five-level hierarchical structure. It is widely used for international comparison of drug utilization statistics, epidemiological studies, and prescription analysis.

WHO drug classification Anatomical Therapeutic Chemical drug statistics medical terminology international standard
code slug name description
A alimentary-tract-and-metabolism Alimentary Tract and Metabolism Classification for drugs acting on the alimentary tract and metabolism.
B blood-and-blood-forming-organs Blood and Blood Forming Organs Classification for drugs acting on blood and blood forming organs.
C cardiovascular-system Cardiovascular System Classification for drugs acting on the cardiovascular system.
D dermatologicals Dermatologicals Classification for drugs acting on the skin.
G genito-urinary-system-and-sex-hormones Genito Urinary System and Sex Hormones Classification for drugs related to the genito-urinary system and sex hormones.
H systemic-hormonal-preparations Systemic Hormonal Preparations, Excl. Sex Hormones and Insulins Classification for systemic hormonal preparations excluding sex hormones and insulins.
J antiinfectives-for-systemic-use Antiinfectives for Systemic Use Classification for antiinfectives administered systemically.
L antineoplastic-and-immunomodulating-agents Antineoplastic and Immunomodulating Agents Classification for antineoplastic and immunomodulating agents.
M musculo-skeletal-system Musculo-Skeletal System Classification for drugs acting on the musculo-skeletal system.
N nervous-system Nervous System Classification for drugs acting on the nervous system.
P antiparasitic-products Antiparasitic Products, Insecticides and Repellents Classification for drugs used for antiparasitic treatment, insecticides and repellents.
R respiratory-system Respiratory System Classification for drugs acting on the respiratory system.
S sensory-organs Sensory Organs Classification for drugs acting on sensory organs (eyes, ears, etc.).
V various Various Classification for various other drugs.

An international classification system for drugs maintained by WHO.