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In this study, we aimed to explore the impact of relevant variants in CYP3A4<\/jats:italic> and CYP2C8<\/jats:italic> and other pharmacogenes, along with demographic characteristics, on cinitapride pharmacokinetics and safety; and to evaluate the impact of CYP2C8<\/jats:italic> alleles on the enzyme's function. Twenty\u2010five healthy volunteers participating in a bioequivalence clinical trial consented to participate in the study. Participants were genotyped for 56 variants in 19 genes, including cytochrome P450 (CYP) enzymes (e.g., CYP2C8 or CYP3A4) or transporters (e.g., SLC or ABC), among others. CYP2C8<\/jats:italic>*3 carriers showed a reduction in AUC of 42% and Cmax<\/jats:sub> of 35% compared to *1\/*1 subjects (p\u2009=<\/jats:italic>\u00a00.003 and p<\/jats:italic>\u00a0=\u20090.011, respectively). *4 allele carriers showed a 45% increase in AUC and 63% in Cmax<\/jats:sub> compared to *1\/*1 subjects, although these differences did not reach statistical significance. CYP2C8<\/jats:italic>*3 and *4 alleles may be used to infer the following pharmacogenetic phenotypes: ultrarapid (UM) (*3\/*3), rapid (RM) (*1\/*3), normal (NM) (*1\/*1), intermediate (IM) (*1\/*4), and poor (PM) metabolizers (*4\/*4). In this study, we properly characterized RMs, NMs, and IMs; however, additional studies are required to properly characterize UMs and PMs. These findings should be relevant with respect to cinitapride, but also to numerous CYP2C8 substrates such as imatinib, loperamide, montelukast, ibuprofen, paclitaxel, pioglitazone, repaglinide, or rosiglitazone.<\/jats:p>","DOI":"10.1111\/cts.13386","type":"journal-article","created":{"date-parts":[[2022,9,6]],"date-time":"2022-09-06T08:43:15Z","timestamp":1662453795000},"page":"2613-2624","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["CYP2C8<\/i><\/scp>*3 and *4 define CYP2C8<\/scp> phenotype: An approach with the substrate cinitapride"],"prefix":"10.1111","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3989-3910","authenticated-orcid":false,"given":"Diana Mar\u00eda","family":"Campod\u00f3nico","sequence":"first","affiliation":[{"name":"Clinical 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