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|  | The Anatomical Therapeutic Chemical (ATC) classification system |  | 
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 Level 5
 
 R - Respiratory systemR06 - Antihistamines for systemic useR06A - Antihistamines for systemic useR06AX - Other antihistamines for systemic useR06AX08 - Pyrrobutamine
 
 Pyrrobutamine
 
 
 
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