| ATC code A: Alimentary tract and metabolism | 
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| Other ATC codes | 
ATC code A Alimentary tract and metabolism is a section of the Anatomical Therapeutic Chemical Classification System, a system of alphanumeric codes developed by the World Health Organization (WHO) for the classification of drugs and other medical products.[1][2][3][4]
Codes for veterinary use (ATCvet codes) can be created by placing the letter Q in front of the human ATC code: for example, QA.[5] 
National issues of the ATC classification may include additional codes not present in this list, which follows the WHO version.
References
- ↑ "ATC (Anatomical Therapeutic Chemical Classification System) – Synopsis". National Institutes of Health. Retrieved 1 February 2020.
 - ↑ World Health Organization. "Anatomical Therapeutic Chemical (ATC) Classification". World Health Organization. Retrieved 3 January 2022.
 - ↑ "Structure and principles". WHO Collaborating Centre for Drug Statistics Methodology. 15 February 2018. Retrieved 3 January 2022.
 - ↑ "ATC/DDD Index 2022: code A". WHO Collaborating Centre for Drug Statistics Methodology.
 - ↑ "ATCvet Index 2022: code QA". WHO Collaborating Centre for Drug Statistics Methodology.
 
Major chemical drug groups – based upon the Anatomical Therapeutic Chemical Classification System  | |
|---|---|
| gastrointestinal tract / metabolism (A)  | |
| blood and blood forming organs (B)  | |
| cardiovascular system (C)  | |
| skin (D) | |
| genitourinary system (G)  | |
| endocrine system (H)  | |
| infections and infestations (J, P, QI)  | |
| malignant disease (L01–L02)  | |
| immune disease (L03–L04)  | |
| muscles, bones, and joints (M)  | |
| brain and nervous system (N)  | 
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| respiratory system (R)  | |
| sensory organs (S) | |
| other ATC (V) | |
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| Magnesium (increases motility) | |
|---|---|
| Aluminium (decreases motility) | |
| Calcium | |
| Sodium | |
| Combinations and complexes of aluminium, calcium and magnesium  | |
| H2 antagonists ("-tidine") | |
|---|---|
| Prostaglandins (E)/ analogues ("-prost-")  | |
| Proton-pump inhibitors  ("-prazole")  | |
| Potassium-competitive  acid blockers ("-prazan")  | 
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| Others | |
| Combinations | |
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Drugs for functional gastrointestinal disorders (A03)  | |||||||||||||
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| Drugs for functional bowel disorders  | 
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| Belladonna and derivatives (antimuscarinics)  | 
 
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| Propulsives | |||||||||||||
| Stool softeners | |
|---|---|
| Stimulant laxatives | |
| Bulk-forming laxatives | |
| Lubricant laxatives | |
| Osmotic laxatives | |
| Enemas | |
| Opioid antagonists | |
| Others | |
| Rehydration | |
|---|---|
| Intestinal anti-infectives | |
| Intestinal adsorbents | 
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| Antipropulsives (opioids) | 
 
 
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| Intestinal anti-inflammatory agents | 
 
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| Antidiarrheal micro-organisms | |
| Other antidiarrheals | |
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| Fat  soluble  | 
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| Water  soluble  | 
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| Combinations | |||||||||
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| Major | 
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| Trace | 
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| Ultratrace | 
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| Androgens (incl. AASTooltip anabolic–androgenic steroid)  | 
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| Antiandrogens | 
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| Amino acids and derivatives | |
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| Enzymes | 
 
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| Other | |
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