Guidelines for ATC classification and DDD assignment - WHOCC

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Tolfenamic acid, see M01AG - Fenamates.
Indometacin in combination with prochlorperazine and caffeine is
classified in M01AB51 – Indometacin, combinations.
N02CA Ergot alkaloids
Ergot alkaloids for gynecological use, see G02A and G02CB.
See also C04AE - Ergot alkaloids.
Dihydroergotamine, which is also used in the treatment of hypotension,
is classified in this group.
Combinations of dihydroergotamine and etilefrine are classified in
C01CA.
The DDD for ergotamine is based on the treatment of acute
migraine attacks, whereas the DDDs for dihydroergotamine and
methysergide are based on prophylaxis.
The DDD for dihydroergotamine nasal spray is based on the
treatment of acute migraine attacks.
N02CB Corticosteroid derivatives
The DDDs for corticosteroid derivatives are based on prophylaxis
of migraine.
N02CC Selective serotonin (5HT1) agonists
The DDDs for the selective serotonin (5HT1) agonists are based on
the recommended initial dose in acute attacks of migraine.
N02CX Other antimigraine preparations
This group comprises antimigraine preparations, which cannot be
classified in the preceding groups.
Clonidine low strength tablets (e.g. 25 mcg) are classified here, even if
the indication also may be “opioid withdrawal symptoms”.