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describing one of a group of drugs used to treat severe mental disorders (psychoses), including schizophrenia and mania; some are administered in small doses to relieve anxiety. Formerly known as major tranquillizers, antipsychotic drugs include the phenothiazines (e.g. chlorpromazine), butyrophenones (e.g. haloperidol), and thioxanthenes (e.g. flupentixol). Side-effects include abnormal involuntary movements (extrapyramidal effects), sedation, dry mouth, blurred vision, and weight gain. atypical a. one of a group of antipsychotics, including clozapine, risperidone, and olanzapine (Zyprexa), that are used in treating patients unresponsive to conventional antipsychotics. Extrapyramidal side-effects are less troublesome.

Subjects: Clinical Pharmacology and Therapeutics.

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