2677TT homozygotes experienced a considerably decreased frequency of fatigue even though on morphine therapy when compared with the wild‐kind ABCB1 haplotype (comprised of 10 SNPs) boosts enzyme activity by regulating mRNA expression; this may describe Element of the phenotypic variability in the pharmacokinetics and pharmacodynamics of UGT2B7 substrates (Innocenti https://theog294ctj0.aboutyoublog.com/profile