No DDDs have been established in this group because the doses used vary substantially.
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.
N01AH - Opioid Anesthetics
Opioid anesthetics in combination with other anesthetics are classified in this group at separate 5th levels using the corresponding 50-series. Transdermal, nasal and sublingual formulations of fentanyl are classified in N02AB.