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The Anatomical Therapeutic Chemical (ATC) classification system
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Level 4
A - Alimentary tract and metabolismA03 - Drugs for functional gastrointestinal disordersA03A - Drugs for functional bowel disordersA03AE - Drugs acting on serotonin receptors
A03AE01 - AlosetronA03AE02 - TegaserodA03AE03 - Cilansetron
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