Guidelines for ATC classification and DDD assignment - WHOCC

The DDDs are based on the treatment of rhinitis. DDDs are given
in volume (i.e. ml). Most of the products classified in this group
are combinations with antihistamines. So far, all these products are
given a fixed DDD of 0.8 ml.
R01AC Antiallergic agents, excl. corticosteroids
Antihistamines, cromoglicate disodium and analogues are classified
here.
The DDD of cromoglicic acid is based on the prophylaxis of
rhinitis. The DDDs of the antihistamines are based on the
maintenance treatment of rhinitis.
R01AD Corticosteroids
Combinations of corticosteroids and antiinfectives, sympathomimetics
etc. should be classified in this group at separate 5th levels by using the
50-series.
Fluticasone propionate is classified in R01AD08.
The DDDs are mainly based on the starting dose in the treatment of
rhinitis.
R01AX Other nasal preparations
This group comprises antiinfectives, antiseptics, mucolytics etc. which
cannot be classified in the preceding groups.
ATC level R01AX10 is an old level where rather obsolete nasal
preparations and sodium chloride nasal products are classified. The
level R01AX30 is for nasal combination products which cannot be
classified in the preceding groups.
Combinations of ipatropium bromide and xylometazoline are classified
in R01AB.
The DDDs are based on the treatment of rhinitis.
235