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. 2019 Dec 31;9:20405. doi: 10.1038/s41598-019-57002-9

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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CYP2D6 phenotypic ratios in normal weight, overweight, and morbid obese subjects with 2 functional alleles before (baseline), at 1 month, and 6 months after bariatric surgery. CYP2D6 phenotypic ratios were assessed with the urinary dextromethorphan/dextrorphan molar ratio (8-hour collection). A lower dextromethorphan/dextrorphan molar ratio implies an increase in CYP2D6 metabolic activity, and viceversa. Abbreviations: DXM: dextromethorphan, DX: dextrorphan, MO: morbidly obese.