Guidelines for ATC classification and DDD assignment - WHOCC

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This means that a product containing paracetamol and phenazone should
be classified in N02BE51 - paracetamol, combinations excl.
psycholeptics and not in N02BB51 - phenazone, combinations excl.
psycholeptics.
Dextropropoxyphene plain, and in combination with other analgesics, is
classified in N02AC.
Cold preparations with therapeutic levels of analgesics are classified in
this group at separate 5th levels by using the 50-series.
Preparations are subdivided on 4th levels according to chemical
structure.
Combinations with ascorbic acid (i.e. 50 mg or more per unit dose) are
classified at separate 5th levels using the corresponding 50-series.
Products containing less than 50 mg per unit dose are classified at the
plain level of the analgesic component.
The DDDs are based on approved dose recommendations.
When establishing DDDs for combination products in the 50-series,
all analgesic components are taken into consideration if the amount
of each component is a therapeutic dose.
The DDD expressed in UD, should normally not exceed the
approved dose recommendations for any of the components. See
list of DDDs for combinations products, www.whocc.no.
For combination products with codeine (i.e. less than 20 mg per
unit dose), the amount of codeine is not taken into account when
assigning a DDD.
N02BA Salicylic acid and derivatives
All salicylic acid derivatives including some commonly regarded as
non-steroid antiinflammatory drugs, e.g. diflunisal, are classified in this
group. See comment under N02 - Analgesics.
Salicylic acid derivatives in combination with corticosteroids are
classified in M01B. Acetylsalicylic acid preparations specifically
intended for use as antithrombotic agents are classified in B01AC.