title: [The plasma levels of haloperidol and reduced haloperidol in Japanese psychiatric patients].
abstract: We measured plasma levels of haloperidol (HAL) and its metabolite, reduced haloperidol (RHAL), in 30 psychiatric patients receiving haloperidol. HAL and RHAL levels were measured by reversed-phase high-performance liquid chromatography. The results were as follows. (1) Plasma levels of HAL had a highly positive correlation with daily dose per body weight (r = 0.902). (2) Distribution of individuals in relation to RHAL levels appeared to have a bimodal pattern. Of these 30 patients studied, 7 were identified as extensive metabolizers (23%). (3) RHAL/HAL ratios showed small intra-individual variance, while inter-individually they varied largely. The mean RHAL/HAL ratio in 30 patients was 0.692; when the 7 extensive metabolizers were excluded, it was 0.491. (4) In the individuals with clinical improvements, plasma levels of HAL and RHAL were 7.45 +/- 4.46, 3.96 +/- 2.16 ng/ml (mean +/- SD), respectively. Patients showing high plasma levels of HAL and RHAL (greater than 30 ng/ml) became aggravated during HAL treatment.
authors.affiliation: Department of Psychiatry, Shiga University of Medical Science, Otsu, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Someya
authors.forename: M
authors.initials: M
authors.lastname: Shibasaki
authors.forename: S
authors.initials: S
authors.lastname: Takahashi
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D044466:Asian People; D002851:Chromatography, High Pressure Liquid; D004305:Dose-Response Relationship, Drug; D005260:Female; D006220:Haloperidol / Q000008:administration & dosage / Q000009:adverse effects / Q000031:analogs & derivatives* / Q000097:blood*; D006801:Humans; D007564:Japan; D008297:Male; D001523:Mental Disorders / Q000097:blood; D008875:Middle Aged
chemical_list: C040692:4-(4-(4-chlorophenyl)-4-hydroxy-1-piperidinyl)-1-(4-fluorophenyl)-1-butanol; D006220:Haloperidol