Use of cis-6-(4-acetanilido)-8,9-dimethoxy-2-methyl-1,-2,3,4,4a, 10b-hexahydro-benzo[c][1,6]naphthyridine in the treatment of obstructive or inflammatory airways disease and disease characterised by, or having an aetiology comprising, morbid eosinophil accumulation, for example asthma, pneumoconiosis, hypereosinophilia, eosinophil related disorders, atopy and bronchitis, as well as novel pharmaceutical compositions comprising said benzonaphthyridine derivative suitable for such use.
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