title: Haloperidol and reduced haloperidol plasma levels in Chinese vs. non-Chinese psychiatric patients.
abstract: Haloperidol and reduced haloperidol plasma concentrations were measured in age-matched Chinese and non-Chinese patients (n = 32). Steady-state plasma concentrations were obtained 10-12 hours after the bedtime dose. Haloperidol and reduced haloperidol concentrations were measured by liquid chromatography and radioimmunoassay. Haloperidol plasma concentrations did not significantly differ between the populations, but reduced haloperidol levels were 3 times greater in non-Chinese patients than in Chinese patients. The incidence of extrapyramidal side effects was higher in Chinese patients (18 vs. 10), while non-Chinese patients with extrapyramidal symptoms had higher reduced haloperidol plasma levels. Logistic regression analysis revealed that ethnicity and reduced haloperidol/haloperidol ratios were important variables in predicting extrapyramidal symptoms. These results suggest that the metabolism and disposition of haloperidol and reduced haloperidol could differ among ethnic populations.
authors.affiliation: Department of Pharmacy Practice, Mercer University Southern School of Pharmacy, Atlanta, GA.
authors.forename: M W
authors.initials: MW
authors.lastname: Jann
authors.forename: W H
authors.initials: WH
authors.lastname: Chang
authors.forename: C M
authors.initials: CM
authors.lastname: Davis
authors.forename: T Y
authors.initials: TY
authors.lastname: Chen
authors.forename: H C
authors.initials: HC
authors.lastname: Deng
authors.forename: F W
authors.initials: FW
authors.lastname: Lung
authors.forename: L
authors.initials: L
authors.lastname: Ereshefsky
authors.forename: S R
authors.initials: SR
authors.lastname: Saklad
authors.forename: A L
authors.initials: AL
authors.lastname: Richards
mesh_terms: D000328:Adult; D044466:Asian People; D001480:Basal Ganglia Diseases / Q000139:chemically induced; D002681:China; D005260:Female; D006220:Haloperidol / Q000009:adverse effects / Q000097:blood*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012559:Schizophrenia / Q000188:drug therapy*; D013781:Texas
chemical_list: D006220:Haloperidol