Abstract
Objective
To clarify the observed variability of haloperidol disposition in patients with psychiatric disorders.
Design
Retrospective population pharmacokinetic study.
Participants
218 Japanese patients aged 16 to 82 years who provided 391 serum haloperidol concentrations.
Methods
Routine clinical pharmacokinetic data gathered from patients receiving haloperidol were analysed to estimate population pharmacokinetic parameters with the nonlinear mixed effects model (NONMEM) computer program.
Results
The final pharmacokinetic model was CL = 42.4 • (TBW/60)0.655 • 0.814AGE≥55 • (DOSE/200)0-236 • 1.32ANTIEP and Vd = 34.4 • TBW • 0.336 AGE≥65, where CL is total body clearance (L/h), Vd is apparent volume of distribution (L), TBW is total bodyweight (kg), DOSE is daily dosage (μg/kg/day), ANTIEP = 1 for concomitant administration of antiepileptic drugs (phenobarbital, phenytoin or carbamazepine) and 0 otherwise, AGE≥55 = 1 for patient aged 55 years or over and 0 otherwise, and AGE≥65 = 1 for patient aged 65 years or over and 0 otherwise. Concomitant administration of haloperidol and antiepileptic drugs resulted in a 32% increase in haloperidol clearance. Patients aged 55 years or over showed an 18.6% reduction in clearance, and elderly patients aged 65 years or over showed a 66.4% reduction in apparent volume of distribution. Inclusion of terms for the concomitant administration of haloperidol and anti-parkinsonian drugs (amantadine, bromocriptine, biperiden, trihexyphenidyl or mazaticol) or cytochrome P450 (CYP) 2D6 substrates (levomepromazine, perphenazine, thioridazine, amitriptyline or clomipramine) did not significantly improve the estimate of haloperidol clearance.
Conclusion
Application of the findings in this study to patient care may permit selection of an appropriate initial maintenance dosage to achieve target haloperidol serum concentrations, thus enabling the clinician to achieve the desired therapeutic effect.
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Acknowledgements
This study was supported by a Grant-in-Aid from the Nakatomi Foundation (E.Y.) and a Grant-in-Aid from the Japan Research Foundation for Clinical Pharmacology (E.Y.).
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Yukawa, E., Hokazono, T., Yukawa, M. et al. Population Pharmacokinetics of Haloperidol Using Routine Clinical Pharmacokinetic Data in Japanese Patients. Clin Pharmacokinet 41, 153–159 (2002). https://doi.org/10.2165/00003088-200241020-00006
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DOI: https://doi.org/10.2165/00003088-200241020-00006