<prompt> drug used in the management of treatment resistant schizophrenia isclozapineolanzapineflupenthixolhaloperissol  <response>: CLOZAPINE Impoance First SGA TREATMENT FOR TREATMENT RESISTANT SCHIZOPHRENIA TOC for TD Anti suicidal Psychosis in parkinsonian patients Ref.kaplon and sadock, synopsis of psychiatry, 11 th dition, 935 