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Anatomical Therapeutic Chemical (ATC) classification [BR:br08303]
  R RESPIRATORY SYSTEM
    R03 DRUGS FOR OBSTRUCTIVE AIRWAY DISEASES
      R03D OTHER SYSTEMIC DRUGS FOR OBSTRUCTIVE AIRWAY DISEASES
        R03DA Xanthines
          R03DA04 Theophylline [DG:DG01061]
            D00371  Theophylline (JP18) <JP/US>

USP drug classification [BR:br08302]
  Respiratory Tract/Pulmonary Agents
    Phosphodiesterase Inhibitors, Airways Disease
      Theophylline [DG:DG01061]
        D00371  Theophylline (JP18)

Therapeutic category of drugs in Japan [BR:br08301]
  2  Agents affecting individual organs
    22  Respiratory organ agents
      225  Bronchodilators
        2251  Xanthines
          D00371  Theophylline (JP18)

Classification of Japanese OTC drugs [BR:br08313]
  Agents for respiratory organs
    26 Antitussives and expectorants
      D00371  Theophylline (JP18)

Risk category of Japanese OTC drugs [BR:br08312]
  First-class OTC drugs
    Inorganic and organic chemicals
      Theophylline
        D00371  Theophylline (JP18)

Drug groups [BR:br08330]
  Respiratory system agent
    DG01616  Xanthine derivative
      DG01609  Xanthine-type bronchodilator
        DG01061  Theophylline
          D00371  Theophylline
  Metabolizing enzyme substrate
    DG01892  CYP1A2 substrate
      DG01061  Theophylline
        D00371  Theophylline

Target-based classification of drugs [BR:br08310]
  G Protein-coupled receptors
    Rhodopsin family
      Adenosine
        ADORA1 [HSA:134] [KO:K04265]
          D00371  Theophylline (JP18) <JP/US>
        ADORA2B [HSA:136] [KO:K04267]
          D00371  Theophylline (JP18) <JP/US>
  Enzymes
    Hydrolases (EC3)
      Phosphodiesterases [EC:3.1.4.-]
        PDE [HSA:10846 27115 50940 5136 5137 5138 5139 5140 5141 5142 5143 5144 5150 5151 5153 8622] [KO:K18438 K18436 K13298 K13755 K18283 K19021 K13296 K13293 K18437]
          D00371  Theophylline (JP18) <JP/US>

Drugs listed in the Japanese Pharmacopoeia [BR:br08311]
  Chemicals
    D00371  Theophylline

Drug metabolizing enzymes and transporters [br08309.html]
  D00371