Disclosed is a novel compound having a xanthine oxidase inhibitory activity. Also disclosed is a pharmaceutical composition which contains such a compound as an active ingredient. Specifically disclosed is a nitrogen-containing heterocyclic compound represented by the general formula (I) below or the like, a pharmaceutically acceptable salt thereof, or a pharmaceutical composition containing any of them as an active ingredient.(I) (In the formula, Y<；SUP>；1<；/SUP>； represents N or C(R<；SUP>；4<；/SUP>；)； Y<；SUP>；2<；/SUP>； represents N or C(R<；SUP>；5<；/SUP>；)； R<；SUP>；4<；/SUP>； and R<；SUP>；5<；/SUP>； independently represent an alkyl group, a hydrogen atom or the like； one of R<；SUP>；1<；/SUP>； and R<；SUP>；2<；/SUP>； represents an optionally substituted aryl group, an alkoxy group or an optionally substituted heterocyclic group； the other one of R<；SUP>；1<；/SUP>； and R<；SUP>；2<；/SUP>； represents a haloalkyl group, a cyano group, a halogen atom or the like； and R<；SUP>；3<；/SUP>； represents a 5-tetrazolyl group or a carboxy group.)
