Abstract:
BACKGROUND:Clozapine is the most effective drug for treatment-resistant schizophrenia, but its use is limited by toxicity. Because ethnicity has been reported to affect clozapine metabolism, we compared its steady state pharmacokinetics in New Zealand Maori and European patients. METHODS:Clozapine and norclozapine steady state bioavailability was assessed over 24h under fasting and fed conditions in 12 Maori and 16 European patients treated for chronic psychotic illnesses with stable once-daily clozapine doses. Plasma clozapine and norclozapine concentrations were assessed using liquid chromatography with tandem mass spectrometry; pharmacokinetic parameters were calculated using standard non-compartmental methods, and compared using unpaired t-tests. FINDINGS:Mean pharmacokinetic parameters (AUC, Cmax and Cmin) for clozapine and norclozapine were virtually identical in Maori and European subjects, under both fed and fasted conditions. DISCUSSION:Clozapine bioavailability does not vary between Maori and European patients, and thus does not need to be considered in prescribing decisions. Additional studies are needed to identify if there are differences between Maori and European populations for drugs metabolized by other enzyme pathways.
journal_name
EBioMedicinejournal_title
EBioMedicineauthors
Menkes DB,Glue P,Gale C,Lam F,Hung CT,Hung Ndoi
10.1016/j.ebiom.2017.11.030subject
Has Abstractpub_date
2018-01-01 00:00:00pages
134-137issn
2352-3964pii
S2352-3964(17)30474-7journal_volume
27pub_type
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