The present invention relates to pharmacotherapy of a psychiatric disorder which is schizophrenia and/or anxiety wherein schizophrenia includes schizophrenia related disorder such as brief psychotic disorders, delusional disorders, schizoaffective disorders, and schizophreniform disorders, and anxiety includes panic disorders, obsessive-compulsive disorders (OCD), post-traumatic stress disorders (PTSD), social phobia or social anxiety disorders, specific phobia, and generalized anxiety disorders (GAD). The compounds of the invention are useful for the treatment of the above psychiatric disorders alone or in combination with other therapeutical agents effective in the treatment of schizophrenia and/or anxiety disorders.
