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Pharmacokinetics of Quetiapine in Overdose and the Effect of Activated Charcoal

Isbister, GK, Friberg, LE, Hackett, LP and Duffull, SB (2007). Pharmacokinetics of Quetiapine in Overdose and the Effect of Activated Charcoal. Clinical Pharmacology and Therapeutics,81(6):821-827.

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Title Pharmacokinetics of Quetiapine in Overdose and the Effect of Activated Charcoal
Author Isbister, GK
Friberg, LE
Hackett, LP
Duffull, SB
Journal Name Clinical Pharmacology and Therapeutics
Publication Date 2007
Volume Number 81
Issue Number 6
ISSN 0009-9236   (check CDU catalogue open catalogue search in new window)
Start Page 821
End Page 827
Total Pages 7
Place of Publication US
Publisher Nature Publishing Group
Field of Research 1115 - Pharmacology and Pharmaceutical Sciences
HERDC Category C1 - Journal Article (DEST)
Abstract The aim of the study was to investigate the pharmacokinetics of quetiapine overdose and the effect of charcoal. The data set included 204 concentration-time points from 54 quetiapine overdose events (median dose 2,700 mg (300-24,000 mg)). Charcoal was administered 0.5-6 h after 19 overdoses. A fully Bayesian methodology for population pharmacokinetic analysis was used and data were modelled using WinBUGS. Uncertainty in the dose history was considered in model building by estimating dose amount and dose time within a possible range. Inclusion of informative priors stabilized the model and population parameter values could be estimated well. A one-compartment model with first-order input and first-order elimination described the data. The final model included uncertainty in dose time. The median and interquartile range of the half-life for individual patients was 6.6 h (4.9-8.4 h). Charcoal was estimated to reduce fraction absorbed by 35%. Co-ingested CYP3A4 inhibitors appeared to decrease clearance and CYP3A4 inducers increase clearance. Charcoal administration may be beneficial after quetiapine overdose.
DOI http://dx.doi.org/10.1038/sj.clpt.6100193   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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Created: Mon, 08 Sep 2008, 16:16:22 CST