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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.

Most of the drugs in this group are topical preparations. Systemic preparations with clear ophthalmological indications are also classified in this group.
Small amounts of antiseptics in eye preparations do not influence the classification, e.g. benzalconium.
See also S03 - Ophthalmological and otological preparations.

This group comprises drugs used in ophthalmological surgery.
Miotics are classified in S01E - Antiglaucoma preparations and miotics.
Mydriatics and cycloplegics are classified in S01F.

Hyaluronic acid injection used during surgical procedures on the eye (e.g. 4-20 mg/ampoule) is classified in this group. Hyaluronic acid injection for intra-articular administration (e.g. 2.5 mg/ampoule) used in the treatment of arthritis is classified in M09A - Other drugs for disorders of the musculo-skeletal system.
Hypromellose is classified in this group. Hypromellose used as artificial tears is, however, classified in S01XA20.

ATC code	Name	DDD	U	Adm.R	Note
S01KA01	hyaluronic acid
S01KA02	hypromellose
S01KA51	hyaluronic acid, combinations

List of abbreviations