The present invention relates to use of a compound for the production of a medicament for treating a patient suffering from a disorder of the central nervous system associated with 5-HT 1A receptor subtype, which the medicament comprising as an active ingredient a carbostyril derivative or a salt thereof represented by the formula (1): wherein the carbon-carbon bond between 3- and 4-positions in the carbostyril skeleton is a single or a double bond； and a pharmaceutically acceptable salt or solvate thereof.
