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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.

This group comprises preparations which can be used in both eye and ear.
Formulations approved for eye, ear and nose should also be classified in S03.
Small amounts of antiseptics (e.g. benzalconium) do not influence the classification.

This group comprises plain and combined antiinfective preparations for use in eye/ear.
Combined preparations are classified at a separate 5th level, S03AA30 - antiinfectives, combinations. This level includes combinations of different antiinfectives and combinations of antiinfectives and other substances.
Combinations with corticosteroids are classified in S03C - Corticosteroids and antiinfectives in combination.

ATC code	Name	DDD	U	Adm.R	Note
S03AA03	polymyxin B

List of abbreviations