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|  | The Anatomical Therapeutic Chemical (ATC) classification system |  | 
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 Level 5
 
 C - Cardiovascular systemC08 - Calcium channel blockersC08D - Selective calcium channel blockers with direct cardiac effectsC08DB - Benzothiazepine derivativesC08DB01 - Diltiazem
 
 Diltiazem
 
 
 
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