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lüll Orofacial dyskinesia Clinical features, mechanisms and drug therapy Kobayashi RMWest J Med 1976[Oct]; 125 (4): 277-88Orofacial or tardive dyskinesias are involuntary repetitive movements of the mouth and face. In most cases, they occur in older psychotic patients who are in institutions and in whom long-term treatment with antipsychotic drugs of the phenothiazine and butyrophenone groups is being carried out. These dyskinesias are frequent in occurrence and characteristically are irreversible. Several biochemical mechanisms have been proposed as causes, including hypersensitivity or partially deneverated brain dopamine receptors and low affinity of the offending drugs for brain muscarinic cholinergic receptors. Clinical therapy has been attempted primarily with drugs that antagonize dopamine receptors or deplete brain dopamine. The benefits of drug treatment have been variable and lack of consistent improvement has been discouraging. Early recognition of dyskinesia should be attempted, and the dose reduced or the drug omitted at the first sign.|*Dyskinesia, Drug-Induced/drug therapy/etiology[MESH]|Antipsychotic Agents/adverse effects[MESH]|Brain/metabolism[MESH]|Female[MESH]|Humans[MESH]|Male[MESH]|Middle Aged[MESH]|Receptors, Dopamine/metabolism[MESH] |