Postal address:
Norwegian Institute of Public Health
WHO Collaborating Centre for Drug Statistics Methodology
Postboks 222 Sk°yen
0213 Oslo

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Myrens verksted 6H
0473 Oslo

Tel:  +47 21 07 81 60

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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.

DDDs have been assigned for antiglaucoma preparations only.


This group comprises plain and combined antiinfective preparations for ophthalmological use.
Combinations with corticosteroids are classified in S01CA - Corticosteroids and antiinfectives in combination.

S01AA Antibiotics

Combinations of different antibiotics (incl. sulfonamides) are classified at a separate 5th level: S01AA30.
Combinations with other drugs (e.g. sympathomimetics) are classified at a separate 5th level: S01AA20.
Combinations with antiinflammatory agents are classified in group S01C.

S01AB Sulfonamides

Combinations with antibiotics are classified in S01AA.

S01AD Antivirals
S01AE Fluoroquinolones
S01AX Other antiinfectives

This group comprises antiinfective preparations for ophthalmological use, which cannot be classified in the preceding groups. Products containing boric acid, also in low strengths, are classified in this group.
Preparations containing benzalconium as the only active substance are classified here, on the 4th level.

Last updated: 2024-01-26