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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 eye/ear preparations, which cannot be classified in the preceding groups.