Anatomical Therapeutic Chemical Classification System for Human Medicines (ATC) is a classification system for drug substances that is maintained by the WHO Division of Drug Management and Policies (DMP). Who can refer to: WHO, World Health Organization The Who, a British rock band The Guess Who, a Canadian rock band who (pronoun), an English language interrogative pronoun. ...

The 5-level classification system is as follows:

• Level 1 Fourteen main groups: Drugs classified by anatomical organ or system•
• Level 2 and Level 3 Therapeutic/pharmacological subgroup•
• Level 4 Therapeutic/pharmacological/chemical subgroup•
• Level 5 The individual substances

Used in Sweden, Czech republic. It is also used in WHO Essential Medicines Library

External links

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--Vojtech Huser 17:06, 16 June 2006 (UTC)