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• W2034150627 abstract "Background and Objectives The most common treatment for opioid dependence is substitution therapy with another opioid such as methadone. The methadone dosage is individualized but highly variable, and program retention rates are low due in part to nonoptimal dosing resulting in withdrawal symptoms and further heroin craving and use. Methadone is a substrate for the P-glycoprotein transporter, encoded by the ABCB1 gene, which regulates central nervous system exposure. This retrospective study aimed to investigate the influence of ABCB1 genetic variability on methadone dose requirements. Methods Genomic deoxyribonucleic acid was isolated from opioid-dependent subjects (n = 60) and non–opioid-dependent control subjects (n = 60), and polymerase chain reaction–restriction fragment length polymorphism and allele-specific polymerase chain reaction were used to determine the presence of single nucleotide polymorphisms at positions 61, 1199, 1236, 2677, and 3435. ABCB1 haplotypes were inferred with PHASE software (version 2.1). Results There were no significant differences in the allele or genotype frequencies of the individual single nucleotide polymorphisms or haplotypes between the 2 populations. ABCB1 genetic variability influenced daily methadone dose requirements, such that subjects carrying 2 copies of the wild-type haplotype required higher doses compared with those with 1 copy and those with no copies (98.3 ± 10.4, 58.6 ± 20.9, and 55.4 ± 26.1 mg/d, respectively; P = .029). In addition, carriers of the AGCTT haplotype required significantly lower doses than noncarriers (38.0 ± 16.8 and 61.3 ± 24.6 mg/d, respectively; P = .04). Conclusion Although ABCB1 genetic variability is not related to the development of opioid dependence, identification of variant haplotypes may, after larger prospective studies have been performed, provide clinicians with a tool for methadone dosage individualization. Clinical Pharmacology & Therapeutics (2006) 80, 682–690; doi: 10.1016/j.clpt.2006.09.011" @default.
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• W2034150627 date "2006-12-01" @default.
• W2034150627 modified "2023-10-13" @default.
• W2034150627 title "ABCB1 genetic variability and methadone dosage requirements in opioid-dependent individuals" @default.
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• W2034150627 doi "https://doi.org/10.1016/j.clpt.2006.09.011" @default.
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