title: Determination of risperidone and 9-hydroxyrisperidone in human plasma by high-performance liquid chromatography: application to therapeutic drug monitoring in Japanese patients with schizophrenia.
abstract: A high-performance liquid chromatographic method has been developed for the simultaneous determination of risperidone and its major active metabolite 9-hydroxyrisperidone in plasma. Risperidone and 9-hydroxyrisperidone in plasma were extracted using a CN bonded-solid phase cartridge, followed by, C4 reversed-phase HPLC separation. Risperidone, 9-hydroxyrisperidone and trazodone as an internal standard were detected by ultraviolet absorbance at 280 nm. It was possible to determine risperidone in the concentration range of 1.0-100.0 ng/ml(-1) and 9-hydroxyrisperidone at a range of 2.0-200.0 ng/ml(-1). The detection limits of risperidone and 9-hydroxyrisperidone were 0.5 and 1.0 ng/ml(-1), respectively. The mean recoveries of risperidone and 9-hydroxyrisperidone added to plasma were less than 92.0 and 92.6%, with a coefficient of variation of less than 10.6 and 10.5%, respectively. This method has been used for the simultaneous determination of steady-state plasma concentration (Css) of risperidone and 9-hydroxyrisperidone in schizophrenic patients treated with 3-, 6-, and 12-mg risperidone oral doses per day.
authors.affiliation: Department of Pharmacy, Hirosaki University Hospital, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nagasaki
authors.forename: T
authors.initials: T
authors.lastname: Ohkubo
authors.forename: K
authors.initials: K
authors.lastname: Sugawara
authors.forename: N
authors.initials: N
authors.lastname: Yasui
authors.forename: H
authors.initials: H
authors.lastname: Furukori
authors.forename: S
authors.initials: S
authors.lastname: Kaneko
mesh_terms: D000328:Adult; D000368:Aged; D014150:Antipsychotic Agents / Q000097:blood*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004334:Drug Administration Schedule; D016903:Drug Monitoring; D005260:Female; D006801:Humans; D007555:Isoxazoles / Q000097:blood*; D007564:Japan; D008297:Male; D008875:Middle Aged; D000068882:Paliperidone Palmitate; D011743:Pyrimidines / Q000097:blood*; D015203:Reproducibility of Results; D018967:Risperidone / Q000008:administration & dosage / Q000097:blood*; D012559:Schizophrenia / Q000097:blood* / Q000188:drug therapy*; D012680:Sensitivity and Specificity
chemical_list: D014150:Antipsychotic Agents; D007555:Isoxazoles; D011743:Pyrimidines; D018967:Risperidone; D000068882:Paliperidone Palmitate