The present invention is to provide condensed heterocyclic derivatives represented by the general formula: Wherein R1 represents hydrogen, halogen, hydroxy etc.； R2 represents hydrogen, halogen or alkyl； R3 and R4 represent hydrogen, hydroxy, halogen etc,； Q represents alkylene etc.； ring A represents aryl or heteroaryl； and G represents or or pharmaceutically acceptable salts thereof, or prodrugs thereof, which exert excellent inhibitory activities in human SGLT and are useful as drugs for the prevention or treatment of a disease associated with hyperglycemia such as diabetes, postprandial hyperglycemia, impaired glucose tolerance, diabetic complications, obesity etc., and pharmaceutical compositions comprising the same, and pharmaceutical uses thereof.本發明提供顯現優異之人體SGLT活性阻礙作用，和對起因於糖尿病、食後高血糖、耐糖能力異常、糖尿病性合併症、肥胖症等高血糖症之作為病患預防或治療藥有用之通式為；(I)；(R1為H、鹵素、OH等，R2為H、鹵素、或烷基，R3及R4各為H、OH、鹵素等，Q為伸烷基等，環A為芳基或雜芳基，G為；(G1)；或；(G2)；)所示的稠合雜環衍生物及其在藥理學上可容許之鹽類，或其藥物前體，及含有其等之醫藥組成物，及其醫藥用途。
