|  | N01 - Anesthetics |  |   |  No DDDs have been established in this group because the doses used vary substantially. 
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  |  | N01A - Anesthetics, General |  This group comprises agents which produce general anesthesia, surgical analgesia or neuroleptanalgesia. See also M03A - Peripherally acting muscle relaxants. Benzodiazepine derivatives are classified in N05BA or N05CD. 
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  |  | N01AF - Barbiturates, plain |  This group comprises barbiturates used as anesthetics. Barbiturates used as hypnotics/sedatives and as premedication, see N05CA - Barbiturates, plain. 
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