It is intended to provide a therapeutic agent and/or a preventive agent for a respiratory disease or a therapeutic agent and/or a preventive agent for a sodium channel associated disease. The present invention provides a pharmaceutical comprising a compound represented by the following formula (I) or a pharmacologically acceptable salt thereof as an active ingredient:Ar1 and Ar2: a heteroaryl group or an aryl group； R1, R2 and R3: a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a halogenated C1-C6 alkyl group, a hydroxy C1-C6 alkyl group, a C1-C6 alkoxy C1-C6 alkyl group or a C3-C7 cycloalkyl group or a cyano group； R4 and R5: a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a halogenated C1-C6 alkyl group, a hydroxyl group, a hydroxy C1-C6 alkyl group, a C1-C6 alkoxy C1-C6 alkyl group, a C3-C7 cycloalkyl group or a C1-C6 alkoxy group；n: an integer of 1 to 3； andthe heteroaryl or aryl group optionally has one or two groups independently selected from a halogen atom, a C1-C6 alkyl group, a halogenated C1-C6 alkyl group, a hydroxyl group, a hydroxy C1-C6 alkyl group, a C1-C6 alkoxy C1-C6 alkyl group, a C3-C7 cycloalkyl group, a carboxyl group, a cyano group, an amino group, a C1-C3 alkylamino group and a di-C1-C3 alkylamino group, and when the heteroaryl or aryl group has two such groups, the two groups are the same as or different from each other.
