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Level 4
R - Respiratory systemR05 - Cough and cold preparationsR05D - Cough suppressants, excluding combinations with expectorantsR05DA - Opium alkaloids and derivatives
R05DA01 - EthylmorphineR05DA03 - HydrocodoneR05DA04 - CodeineR05DA05 - Opium alkaloids with MorphineR05DA06 - NormethadoneR05DA07 - NoscapineR05DA08 - PholcodineR05DA09 - DextromethorphanR05DA10 - ThebaconR05DA11 - DimemorfanR05DA12 - AcetyldihydrocodeineR05DA20 - Opium alkaloids and derivatives, combinationsR05DA54 - Codeine, combinations
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