Inhaled antiinfectives are classified in ATC group J - Antiinfectives for systemic use.

Varenicline nasal spray used for dry eye disease is classified in S01XA.

This group comprises preparations for local treatment in nasal congestion (e.g. sympathomimetics) or for prophylaxis and treatment of allergic rhinitis (e.g. corticosteroids, cromoglicate preparations). Most of the products are nasal drops, nasal sprays or nasal inhalants. Formulations approved for eye, ear and nose are classified in S03.
See also R01B - Nasal decongestants for systemic use, and
R06 - Antihistamines for systemic use.

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.