Guidelines for ATC classification and DDD assignment - WHOCC

R07AA Lung surfactants
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This group comprises surface-tension lowering agents used in
respiratory distress syndrome. Combinations of different lung
surfactants are classified in R07AA30, e.g. sinapultide in combination
with other lung surfactants are classified here.
The DDDs of colfosceril palmitate and natural phospholipids are
based on the treatment of respiratory distress syndrome in neonates,
and correspond to the treatment of children weighing 1.6 kg.
R07AB Respiratory stimulants
Centrally acting respiratory stimulants mainly used for asthma and
similar respiratory diseases (e.g. theophylline) are classified in R03D.
Other respiratory stimulants are classified here. This group includes
plain and combined preparations.
Combinations with respiratory stimulants and caffeine are classified in
this group. Plain caffeine preparations are classified in N06B
Psychostimulants, agents used for ADHD and nootropics.
This group includes various drugs used on different indications.
The DDDs are therefore established individually for each ATC 5th
level.
R07AX Other respiratory system products
This group comprises preparations used for respiratory disorders, which
cannot be classified in the preceding groups.
Nitric oxide is classified here, other medical gases, see V03AN.