title: Plasma haloperidol and reduced haloperidol concentrations in a geriatric population.
abstract: Haloperidol (HL) and reduced haloperidol (RH) plasma concentrations were measured in geriatric patients (n = 45) and schizophrenic patients (n = 8). In the elderly patients, HL doses were 1-4 mg/day while only 2 mg/day was used in the schizophrenics. At HL 2 mg/day dose in both age groups, mean plasma HL levels were approximately twice as high in the elderly patients compared to the schizophrenics (1.39 +/- 0.82 vs. 0.56 +/- 0.23 ng/ml, p < 0.02). RH plasma concentrations were almost 5 times greater in the elderly patients (0.54 +/- 0.35 vs. 0.09 +/- 0.05 ng/ml, p < 0.0001). These results suggest that HL plasma concentrations in the elderly are greater than in adult schizophrenic patients treated with similar HL doses.
authors.affiliation: Laboratory of Biological Psychiatry, Taipei City Psychiatric Center, Taiwan.
authors.forename: W H
authors.initials: WH
authors.lastname: Chang
authors.forename: M W
authors.initials: MW
authors.lastname: Jann
authors.forename: T S
authors.initials: TS
authors.lastname: Chiang
authors.forename: H N
authors.initials: HN
authors.lastname: Lin
authors.forename: W H
authors.initials: WH
authors.lastname: Hu
authors.forename: C P
authors.initials: CP
authors.lastname: Chien
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D014150:Antipsychotic Agents / Q000008:administration & dosage / Q000493:pharmacokinetics*; D001714:Bipolar Disorder / Q000097:blood / Q000188:drug therapy / Q000523:psychology; D003704:Dementia / Q000097:blood* / Q000188:drug therapy / Q000523:psychology; D004305:Dose-Response Relationship, Drug; D005260:Female; D006220:Haloperidol / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000493:pharmacokinetics*; D006801:Humans; D008297:Male; D008657:Metabolic Clearance Rate / Q000502:physiology; D008875:Middle Aged; D011569:Psychiatric Status Rating Scales; D012559:Schizophrenia / Q000097:blood* / Q000188:drug therapy; D012565:Schizophrenic Psychology
chemical_list: D014150:Antipsychotic Agents; C040692:4-(4-(4-chlorophenyl)-4-hydroxy-1-piperidinyl)-1-(4-fluorophenyl)-1-butanol; D006220:Haloperidol