Abstract
Purpose
Therapeutic drug monitoring (TDM) of antipsychotics can aid in therapy optimization, explaining adverse effects or non-response. One reason for therapeutic failure or adverse effects is caused by genetic variations in the cytochrome P450 drug-metabolizing genes. The aim of this study was to evaluate the impact of CYP2D6 polymorphisms on steady-state serum concentrations of antipsychotics metabolized by CYP2D6, taking into account the co-medication with CYP2D6 inhibitors.
Methods
Serum and EDTA samples were collected from 82 psychiatric patients. After a liquid-liquid extraction, serum samples were analyzed using an ultra-high performance liquid chromatography-tandem mass spectrometric (UHPLC-MS/MS) method for quantification of the antipsychotics. CYP2D6 genotyping was performed using the Luminex xTAG® CYP2D6 Kit v3 (Luminex Corporation). Patients were divided into five phenotype subgroups by calculation of the activity score (AS): poor metabolizers (PM; AS 0), intermediate metabolizers (IM; AS 0.5–1), extensive metabolizers with slow activity (EM-s; AS 1–1.5), extensive metabolizers with fast activity (EM-f; AS 2), and ultra-rapid metabolizers (UM; AS >2). The influence of the phenotypes on the concentration-to-dose and metabolite-to-parent ratios was evaluated.
Results
Overall, 6.1 % UM (n = 5), 25.6 % EM-f (n = 21), 46.3 % EM-s (n = 38), 1.2 % EM-s/EM-f (n = 1), 6.1 % IM (n = 5), and 14.6 % PM (n = 12) were found, taking co-administration of strong and moderate CYP2D6 inhibitors into account (phenoconversion). It was demonstrated that CYP2D6 polymorphisms affect the serum concentrations of aripiprazole (n = 18), haloperidol (n = 11), risperidone (n = 20), and zuclopenthixol (n = 6), while no influence was seen on the paliperidone serum concentrations (n = 31).
Conclusions
Even with a small number of patients per antipsychotic, the importance of CYP2D6 genotyping was still clearly stated. This study illustrates the high potential of combining TDM and CYP2D6 genotyping in clinical practice.
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Abbreviations
- AS:
-
Activity score
- ARI:
-
Aripiprazole
- C/D:
-
Concentration-to-dose ratio
- CYP:
-
Cytochrome P450
- DD:
-
Daily dose
- DARI:
-
Dehydro-aripiprazole
- DEF:
-
Allele with deficient function
- EM:
-
Extensive metabolizer
- EM-f:
-
Extensive metabolizer with fast activity
- EM-s:
-
Extensive metabolizer with slow activity
- HAL:
-
Haloperidol
- IM:
-
Intermediate metabolizer
- JT:
-
Jonckheere-Terpstra test
- MW-U:
-
Mann-Whitney U test
- M/P:
-
Metabolite-to-parent ratio
- NF:
-
Allele with normal function
- PAL:
-
Paliperidone
- PM:
-
Poor metabolizer
- RED:
-
Allele with reduced function
- RHAL:
-
Reduced haloperidol
- RIS:
-
Risperidone
- TDM:
-
Therapeutic drug monitoring
- UHPLC-MS/MS:
-
Ultra-high performance liquid chromatography-tandem mass spectrometry
- UM:
-
Ultra-rapid metabolizer
- ZUC:
-
Zuclopenthixol
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An erratum to this article can be found at http://dx.doi.org/10.1007/s00228-016-2144-8.
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Lisbeth, P., Vincent, H., Kristof, M. et al. Genotype and co-medication dependent CYP2D6 metabolic activity: effects on serum concentrations of aripiprazole, haloperidol, risperidone, paliperidone and zuclopenthixol. Eur J Clin Pharmacol 72, 175–184 (2016). https://doi.org/10.1007/s00228-015-1965-1
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DOI: https://doi.org/10.1007/s00228-015-1965-1