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Treatment-Resistant Schizophrenia
FazaClo® (clozapine, USP) is indicated for the management of severely ill schizophrenic patients who fail to respond adequately to standard drug treatment for schizophrenia. Because of the significant risk of agranulocytosis and seizure associated with its use, FazaClo should be used only in treatment for schizophrenia. Because of the significant risk of agranulocytosis and seizure associated with its use, FazaClo should be used only in patients who have failed to respond adequately to treatment with appropriate courses of standard drug treatments for schizophrenia, either because of insufficient effectiveness or the inability to achieve an effective dose due to intolerable adverse effects from those drugs. (See WARNINGS.)
The effectiveness of clozapine in a treatment-resistant schizophrenic population was demonstrated in a 6-week study comparing clozapine and chlorpromazine. Patients meeting DSM-III criteria for schizophrenia and having a mean Brief Psychiatric Rating Scale (BPRS) total score of 61 were demonstrated to be treatment-resistant by history and by open, prospective treatment with haloperidol before entering into the double-blind phase of the study. The superiority of clozapine to chlorpromazine was documented in statistical analyses employing both categorical and continuous measures of treatment effect.
Because of the significant risk of agranulocytosis and seizures, events which both present a continuing risk over time, the extended treatment of patients failing to show an acceptable level of clinical response should ordinarily be avoided. In addition, the need for continuing treatment in patients exhibiting beneficial clinical responses should be periodically reevaluated.
Reduction in the Risk of Recurrent Suicidal Behavior in Schizophrenia or Schizoaffective Disorders
FazaClo is indicated for reducing the risk of recurrent suicidal behavior in patients with schizophrenia or schizoaffective disorder who are judged to be at chronic risk for reexperiencing suicidal behavior, based on history and recent clinical state. Suicidal behavior refers to actions by a patient that put him/herself at risk for death.
The effectiveness of clozapine in reducing the risk of recurrent suicidal behavior was demonstrated over a two-year treatment period in the InterSePT™ Trial (see Clinical Trial Data under CLINICAL PHARMACOLOGY). Therefore, FazaClo treatment to reduce the risk of suicidal behavior should be continued for at least two years (see DOSAGE AND ADMINISTRATION).
The prescriber should be aware that a majority of patients in both treatment groups in InterSePT™ received other treatments as well to reduce suicide risk, such as antidepressants and other medications, hospitalization, and/or psychotherapy. The contributions of these additional measures are unknown.
Phenylketonurics: FazaClo Orally Disintegrating Tablets contain phenylalanine.
CONTRAINDICATIONS: FazaClo is contraindicated in patients with previous hypersensitivity to clozapine, myeloproliferative disorders, uncontrolled epilepsy, paralytic ileus, history of clozapine-induced agranulocytosis or severe granulocytopenia, and in severe central nervous system (CNS) depression or comatose states from any cause. FazaClo should not be used simultaneously with other agents having a well-known potential to cause agranulocytosis or otherwise suppress bone marrow function.
WARNINGS/PRECAUTIONS: Due to the risk of agranulocytosis, clozapine should be reserved for (1) severely ill patients with schizophrenia who fail to respond adequately to standard drug treatment, or (2) patients with schizophrenia or schizoaffective disorder at risk of recurrent suicidal behavior. Patients being treated with clozapine must have a baseline white blood cell (WBC) count and absolute neutrophil count (ANC) before initiation of treatments as well as regular WBC counts and ANCs during treatment and for at least 4 weeks after discontinuation of treatment. Analyses of post-marketing safety databases suggest that clozapine is associated with an increased risk of fatal myocarditis, especially during, but not limited to, the first month of therapy. In patients in whom myocarditis is suspected, clozapine treatment should be promptly discontinued. Seizures have been associated with clozapine, with a greater likelihood at higher doses. Orthostatic hypotension, with or without syncope, can occur with clozapine treatment. Rarely, collapse can be profound and be accompanied by respiratory and/or cardiac arrest. Orthostatic hypotension is more likely to occur during initial titration in association with rapid dose escalation. Elderly patients with dementia-related psychosis treated with atypical antipsychotic drugs are at an increased risk of death compared to placebo. FazaClo is not approved for the treatment of those patients.
Commonly Observed Adverse Events observed in association with the use of clozapine in clinical trials at an incidence of greater than 5% were: CNS complaints, including drowsiness/sedation, dizziness/vertigo, headache, and tremor; autonomic nervous system complaints, including salivation, sweating, dry mouth, and visual disturbances; cardiovascular findings, including tachycardia, hypotension, and syncope; gastrointestinal complaints, including constipation and nausea; and fever. 16% of 1080 patients who received clozapine in premarketing clinical trials discontinued treatment due to an adverse event.