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The Anatomical Therapeutic Chemical (ATC) classification system



Level 3

  • R - Respiratory system
  • R03 - Drugs for obstructive airway diseases
  • R03D - Other systemic drugs for obstructive airway diseases

  • R03DA - Xanthines
  • R03DB - Xanthines and adrenergics
  • R03DC - Leukotriene receptor antagonists
  • R03DX - Other systemic drugs for obstructive airway diseases






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