| This group comprises plain and combined antihistamine preparations for systemic use. Antihistamines used in motion sickness are classified in this group. Other preparations used in motion sickness, see A04 - Antiemetics and antinauseants.See also N07C - Antivertigo preparations.
 Combined preparations (incl. combinations with hydroxyzine) are classified at separate 5th levels using the corresponding 50-series.
 Combinations of antihistamines are classified at a separate 4th level, R06AK.
 Antihistamines are also included in combined preparations classified in other groups:
 Combinations with analgesics - N02
 Combinations with xanthines - R03DA
 Combinations with leukotriene receptor antagonists - R03DC.
 Combinations with expectorants - R05C
 Combinations with nasal decongestants for systemic use - R01B
 Combinations with cough suppressants - R05D
 Allergen extracts, see V01.
 The group is subdivided according to chemical structure.
 
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