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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