Anatomical Therapeutic Chemical Classification System
The Anatomical Therapeutic Chemical (ATC) Classification System is used for the
- EphMRA Anatomical Classification (ATC and NFC)
- ATC Code List
- Classification of Pharmaco-Therapeutic Referrals (CPR)
- Family medicine / Family practice
- General practice
- ICD-10 International Classification of Diseases
- International Classification of Primary Care (ICPC-2) / ICPC-2 PLUS
- Medical classification
- Pharmaceutical care
- Pharmacist / Pharmacy
- Primary care
- Referral (medicine)
ATC follows guidelines  in creating new codes for newly approved drugs. In order to create a new ATC code, an application has to be sent to ATC. New ATC codes are published twice annually. A formal release of new ATC edition occurs once a year.
Updates to ATC
National issues of the ATC classification, such as the German Anatomisch-therapeutisch-chemische Klassifikation mit Tagesdosen, may include additional codes and DDDs not present in the WHO version.
The ATC system also includes defined daily doses (DDDs) for many drugs. This is a measurement of drug consumption based on the usual daily dose for a given drug. According to the definition, "[t]he DDD is the assumed average maintenance dose per day for a drug used for its main indication in adults."
Defined daily dose
The Anatomical Therapeutic Chemical Classification System for veterinary medicinal products (ATCvet) is used to classify veterinary drugs. ATCvet codes can be created by placing the letter Q in front of the ATC code of most human medications. For example, furosemide for veterinary use has the code QC03CA01.
Example: C03CA01 Furosemide
The fifth level of the code indicates the chemical substance and consists of two digits.
Example: C03CA Sulfonamides
The fourth level of the code indicates the chemical/therapeutic/pharmacological subgroup and consists of one letter.
Example: C03C High-ceiling diuretics
The third level of the code indicates the therapeutic/pharmacological subgroup and consists of one letter.
The second level of the code indicates the therapeutic main group and consists of two digits.
|A||Alimentary tract and metabolism|
|B||Blood and blood forming organs|
|G||Genito-urinary system and sex hormones|
|H||Systemic hormonal preparations, excluding sex hormones and insulins|
|J||Antiinfectives for systemic use|
|L||Antineoplastic and immunomodulating agents|
|P||Antiparasitic products, insecticides and repellents|
The first level of the code indicates the anatomical main group and consists of one letter. There are 14 main groups:
In this system, drugs are classified into groups at 5 different levels:
- First level 1.1
- Second level 1.2
- Third level 1.3
- Fourth level 1.4
- Fifth level 1.5
- ATCvet 1.6
- Defined daily dose 2
- Purpose 3
- National adaptations 4
- Updates to ATC 5
- See also 6
- References 7
- External links 8
This therapeutic and chemical characteristics. 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: acetylsalicylic acid (aspirin), for example, has A01 as a drug for local oral treatment, B01 as a platelet inhibitor, and N02 as an analgesic and antipyretic. On the other hand, several different brands share the same code if they have the same active substance and indications.