Guidelines for ATC classification and DDD assignment - WHOCC

N02AG Opioids in combination with antispasmodics
Preparations are classified at 5th levels according to the analgesic. At
each level different antispasmodics may occur.
The DDDs in this group are as far as possible equipotent to the
DDD for parenteral morphine.
N02AX Other opioids
The group comprises opioids, which cannot be classified in the
preceding groups.
N02B OTHER ANALGESICS AND ANTIPYRETICS
See general considerations under N02.
Combinations with opioid analgesics should be classified in N02A at
separate 5th levels, using the corresponding 50-series (combinations
excl. psycholeptics) or the 70-series (combinations with psycholeptics)
or in N02AG - Opioids in combination with antispasmodics.
Combinations with codeine or dihydrocodeine are, however, classified
in this group if the codeine or dihydrocodeine content per unit dose is
less than 20 mg. Otherwise these combinations are classified in
N02AA.
Combined preparations which contain more than one analgesic, should
be classified by using the following ranking:
1. Phenacetin
2. Bucetin
3. Dipyrocetyl
4. Paracetamol
5. Acetylsalicylic acid
6. Phenazone
7. Salicylamide
8. Propyphenazone
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