title: The effect of neuroleptic discontinuation on psychopathology, involuntary movements, and biochemical measures in patients with persistent tardive dyskinesia.
abstract: As some of the pharmacological activities of neuroleptic medication may involve pathophysiological mechanisms underlying schizophrenia and tardive dyskinesia (TD), it is useful to study patients undergoing medication discontinuation. In this study, 19 stable, neuroleptic-maintained patients with persistent TD underwent taper and discontinuation of their neuroleptic medication over a 3-week period, and multiple behavioral and biochemical (plasma HVA, MHPG, and prolactin) measures were obtained. The major finding was that early relapsing patients had lower baseline and a significantly greater increase in plasma HVA levels after discontinuation than nonrelapsing patients. In addition, patients exhibiting withdrawal-exacerbated TD had significantly lower plasma MHPG levels than patients not exhibiting this phenomenon. The clinical and pharmacological implications of these findings are discussed.
authors.affiliation: Department of Psychiatry, Yale University School of Medicine, New Haven, CT 06519.
authors.forename: W M
authors.initials: WM
authors.lastname: Glazer
authors.forename: M B
authors.initials: MB
authors.lastname: Bowers
authors.forename: D S
authors.initials: DS
authors.lastname: Charney
authors.forename: G R
authors.initials: GR
authors.lastname: Heninger
mesh_terms: D014150:Antipsychotic Agents / Q000008:administration & dosage / Q000009:adverse effects*; D001921:Brain / Q000187:drug effects; D004298:Dopamine / Q000097:blood*; D004305:Dose-Response Relationship, Drug; D004409:Dyskinesia, Drug-Induced / Q000097:blood*; D005260:Female; D006719:Homovanillic Acid / Q000097:blood; D006801:Humans; D008297:Male; D008734:Methoxyhydroxyphenylglycol / Q000097:blood; D008875:Middle Aged; D011388:Prolactin / Q000097:blood; D011941:Receptors, Adrenergic / Q000187:drug effects; D011954:Receptors, Dopamine / Q000187:drug effects; D012559:Schizophrenia / Q000188:drug therapy*; D012565:Schizophrenic Psychology; D013375:Substance Withdrawal Syndrome / Q000097:blood*
chemical_list: D014150:Antipsychotic Agents; D011941:Receptors, Adrenergic; D011954:Receptors, Dopamine; D008734:Methoxyhydroxyphenylglycol; D011388:Prolactin; D004298:Dopamine; D006719:Homovanillic Acid