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There is an incredible amount of diversity in Asian and admixed populations that has not been addressed in a pharmacogenetic context. The known pharmacogenetic differences in Asian subgroups generally represent previously known variants that are present at much lower or higher frequencies in Asians compared with other populations. In this review we summarize the main drugs and known genes that appear to have differences in their pharmacogenetic properties in certain Asian populations. Evidence\u2010based guidelines and summary statistics from the US Food and Drug Administration and the Clinical Pharmacogenetics Implementation Consortium were analyzed for ethnic differences in outcomes. Implicated drugs included commonly prescribed drugs such as warfarin, clopidogrel, carbamazepine, and allopurinol. The majority of these associations are due to Asians more commonly being poor metabolizers of cytochrome P450 (CYP) 2C19 and carriers of the human leukocyte antigen (HLA)\u2010B*15:02 allele. The relative risk increase was shown to vary between genes and drugs, but could be &gt; 100\u2010fold higher in Asians. Specifically, there was a 172\u2010fold increased risk of Stevens\u2012Johnson syndrome and toxic epidermal necrolysis with carbamazepine use among HLA\u2010B*15:02 carriers. The effects ranged from relatively benign reactions such as reduced drug efficacy to severe cutaneous skin reactions. These reactions are severe and prevalent enough to warrant pharmacogenetic testing and appropriate changes in dose and medication choice for at\u2010risk populations. Further studies should be done on Asian cohorts to more fully understand pharmacogenetic variants in these populations and to clarify how such differences may influence drug response.<\/jats:p>","DOI":"10.1111\/cts.12771","type":"journal-article","created":{"date-parts":[[2020,2,26]],"date-time":"2020-02-26T10:49:37Z","timestamp":1582714177000},"page":"861-870","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":90,"title":["Pharmacogenomics in Asian Subpopulations and Impacts on Commonly Prescribed Medications"],"prefix":"10.1111","volume":"13","author":[{"given":"Cody","family":"Lo","sequence":"first","affiliation":[{"name":"Faculty of Medicine University of British Columbia Vancouver British Columbia Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Samantha","family":"Nguyen","sequence":"additional","affiliation":[{"name":"College of Pharmacy Mercer University Atlanta Georgia USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christine","family":"Yang","sequence":"additional","affiliation":[{"name":"School of Medicine Stanford University Palo Alto California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lana","family":"Witt","sequence":"additional","affiliation":[{"name":"School of Medicine Stanford University Palo Alto California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alice","family":"Wen","sequence":"additional","affiliation":[{"name":"School of Medicine Stanford University Palo Alto California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"T. 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