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|  | The Anatomical Therapeutic Chemical (ATC) classification system |  | 
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 Level 3
 
 C - Cardiovascular systemC03 - DiureticsC03E - Diuretics and potassium-sparing agents in combination
 
 C03EA - Low-ceiling diuretics and potassium-sparing agentsC03EB - High-ceiling diuretics and potassium-sparing agents
 
 
 
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