Abstract
Background and Objective
Memantine, a frequently prescribed anti-dementia drug, is mainly eliminated unchanged by the kidneys, partly via tubular secretion. Considerable inter-individual variability in plasma concentrations has been reported. We aimed to investigate clinical and genetic factors influencing memantine disposition.
Methods
A population pharmacokinetic study was performed including data from 108 patients recruited in a naturalistic setting. Patients were genotyped for common polymorphisms in renal cation transporters (SLC22A1/2/5, SLC47A1, ABCB1) and nuclear receptors (NR1I2, NR1I3, RXR, PPAR) involved in transporter expression.
Results
The average clearance was 5.2 L/h with a 27 % inter-individual variability (percentage coefficient of variation). Glomerular filtration rate (p = 0.007) and sex (p = 0.001) markedly influenced memantine clearance. NR1I2 rs1523130 was identified as the unique significant genetic covariate for memantine clearance (p = 0.006), with carriers of the NR1I2 rs1523130 CT/TT genotypes presenting a 16 % slower memantine elimination than carriers of the CC genotype.
Conclusion
The better understanding of inter-individual variability of memantine disposition might be beneficial in the context of individual dose optimization.
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Acknowledgments
We thank N. Laverrière, Dr F. Sali, Dr G. Schopf, Dr V. Falciola, Dr C. Costa, Dr M. Benouioua, Dr M. Quiroz, Dr P. Roungas and Dr T. Bui for patient enrolment, A. Kottelat, M. Brocard, M. Delessert, N. Cochard, C. Brogli, V. Hodel and A.C. Aubert for sample analyses, K. Powell Golay for editorial assistance and E. Ponce for help with bibliography. We thank the Vital-IT (http://www.vital-it.ch) Center for High-Performance Computing of the Swiss Institute of Bioinformatics for providing the computational resources for the population analyses.
Conflict of interest
The authors declare no conflict of interest.
Funding
This study was supported by internal funds of the Unit of Pharmacogenetics and Clinical Psychopharmacology, Department of Psychiatry, University Hospital Lausanne and by a private donation (Irène Allenbach) in support of research on Alzheimer’s disease.
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Noetzli, M., Guidi, M., Ebbing, K. et al. Population Pharmacokinetic Study of Memantine: Effects of Clinical and Genetic Factors. Clin Pharmacokinet 52, 211–223 (2013). https://doi.org/10.1007/s40262-013-0032-2
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DOI: https://doi.org/10.1007/s40262-013-0032-2