Mucin production inhibitor

摘要

To provide a drug useful for prevention or treatment of respiratory diseases accompanying hyper-secretion of mucus, the drug normalizing physiological functions of the respiratory tract by preventing over-production of mucin from the respiratory tract epithelium. A mucin production inhibitor comprising, as an active ingredient, a benzimidazole derivative represented by formula (1): (wherein A represents a triazole group; R¹ and R² may be identical to or different from each other, and each represents an aliphatic hydrocarbon group which may have an alicyclic hydrocarbon group, or an alicyclic hydrocarbon group; R³ represents a hydrogen atom or a substituent; and R⁴ represents a hydrogen atom or a protective group for the nitrogen atom) or a pharmacologically acceptable salt thereof.