A formulation approved both for use in the eye/ear is classified in S03. Formulations approved for eye, ear and nose are also classified in S03. Formulations only licensed for use in the eye or the ear are classified in S01 and S02, respectively.

Small amounts of antiseptics in otological preparations do not influence the classification, e.g. benzalconium.
See also S03 - Ophthalmological and otological preparations.

This group comprises plain and combined antiinfective preparations for otological use.
Combined preparations are classified at a separate 5th level - S02AA30 - antiinfectives, combinations. This level includes combinations of different antiinfectives and combinations of antiinfectives/other substances.
Combinations with corticosteroids are classified in S02C - Corticosteroids and antiinfectives in combination.

Ciprofloxacin, declared as ear drops, is classified here.