Determination of risperidone and enantiomers of 9-hydroxyrisperidone in plasma by LC-MS/MS |
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Authors: | Cabovska B Cox S L Vinks A A |
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Institution: | Laboratory of Applied Pharmacokinetics and Therapeutic Drug Management, Pediatric Pharmacology Research Unit, Cincinnati Children's Hospital Medical Center, 3333 Burnet Avenue (MLC 6018), Cincinnati, OH 45229-3039, USA. Baiba.Cabovska@cchmc.org |
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Abstract: | A robust and validated liquid-liquid extraction LC-MS/MS method was developed for population pharmacokinetic analysis and therapeutic drug monitoring of risperidone and the enantiomers of its major active metabolite (+)-and (-)9-hydroxyrisperidone in pediatric patients. The method was rapid, sensitive and used a low sample amount (200 microL), which is very desirable for the pediatric population. The assay was validated from 0.2 to 50 ng/mL in plasma for all analytes. LLOQ for all analytes was 0.2 ng/mL. The extracts were analyzed by normal phase LC-MS/MS. The sample run time was 8 min. Intra- and interday precision for all analytes was < or =6%; method accuracy was between 89 and 99%. Additional experiments were performed to analyze matrix effects and identify a proper internal standard for each analyte. The validated method was used to study risperidone and its enantiomer metabolites in plasma as part of a population pharmacokinetic study in pediatric patients with pervasive developmental disorder (PDD). |
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