The World Health Organization's (WHO) Anatomical Therapeutic Chemical (ATC) classification system is used to categorize and organize medical drugs. The ATC classification groups drugs based on their therapeutic properties, chemical composition, and anatomical effects. This standardized method helps ensure that essential medicines are readily available and helps in managing and distributing medical resources globally. The ATC system is widely used by countries around the world and plays an important role in the pharmaceutical industry.
In the ATC classification system, the active substances are divided into fourteen main groups or 1st levels according to the organ or system on which they act and their therapeutic, pharmacological and chemical properties.