Anatomical Therapeutic Chemical Classification System (ATC)

In the Anatomical Therapeutic Chemical (ATC) classification system, the active substances are divided into different groups according to the organ or system on which they act and their therapeutic, pharmacological and chemical properties. Drugs are classified in groups at five different levels.

ATC groups

The system has fourteen main anatomical/pharmacological groups or 1st levels.

Alimentary tract and metabolism
Blood and blood forming organs
Cardiovascular system
Genito urinary system and sex hormones
Systemic hormonal preparations, excl. Sex hormones and insulins
Antiinfectives for systemic use
Antineoplastic and immunomodulating agents
Musculo-skeletal system
Nervous system
Antiparasitic products, insecticides and repellents
Respiratory system
Sensory organs