This group comprises preparations with expectorants and mucolytics.
Combined preparations are classified at separate 5th levels using the code number 10. These may also contain e.g. antihistamines. Combinations with adrenergics, e.g. ambroxol and clenbuterol, used in e.g. bronchial asthma are classified in R03C - Adrenergics for systemic use.
Preparations, which contain small amounts of herbal extracts, menthol etc., are regarded as plain preparations.