Pharmaceutical preparation comprising a DPP-IV inhibitor and other therapeutic agents of diabetes concomitantly or combined

A medicament comprising a compound represented by the following general formula (I), a salt thereof or a solvate thereof, for use in treating type 2 diabetes, diabetic complications, alteration in tolerance the glucose, insulin resistance or obesity, wherein said medicament is administered concomitantly with at least one kind of other diabetic drugs selected from the group consisting of a biguanide and an inhibitor of a-glucosidase: ** ** formula wherein R1, R2, R3 and R4 are each a hydrogen atom, a trifluoromethyl group or a C1-3 alkyl group.