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.
S01 - Ophthalmologicals
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.
S01G - Decongestants and Antiallergics
This group comprises drugs used to treat symptoms of e.g. allergy.
S01GX - Other Antiallergics
Combinations of cromoglicic acid and antihistamines are classified in S01GX51.