{"id":69098,"date":"2026-02-24T09:36:27","date_gmt":"2026-02-24T08:36:27","guid":{"rendered":"https:\/\/www.easly.nl\/biomarkers\/cyp3a5\/"},"modified":"2026-02-24T11:13:28","modified_gmt":"2026-02-24T10:13:28","slug":"cyp3a5","status":"publish","type":"biomarkers","link":"https:\/\/www.easly.nl\/en\/biomarkers\/cyp3a5\/","title":{"rendered":"CYP3A5"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"69098\" class=\"elementor elementor-69098 elementor-69057\" data-elementor-post-type=\"biomarkers\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-f57c681 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"f57c681\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-2d01af8\" data-id=\"2d01af8\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-49d0726 elementor-widget elementor-widget-heading\" data-id=\"49d0726\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">What is CYP3A5?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-db9b857 elementor-widget elementor-widget-text-editor\" data-id=\"db9b857\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The CYP3A5 gene is the blueprint for an enzyme that, along with CYP3A4, is responsible for processing a large portion of the medications we use today. What&#8217;s unique about CYP3A5 is that a large portion of the European population naturally produces very little of it (the so-called &#8220;non-expressors&#8221;). Your CYP3A5 status is genetically determined and remains unchanged throughout your life.<\/p>\n<p>The gene determines whether your liver activates this specific enzyme, and to what extent. This has a direct and often significant impact on how quickly certain medications are cleared from your blood.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-a323303 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"a323303\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-db6e995\" data-id=\"db6e995\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2aecd62 elementor-widget elementor-widget-heading\" data-id=\"2aecd62\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Why test your CYP3A5 status?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-66f1bc1 elementor-widget elementor-widget-text-editor\" data-id=\"66f1bc1\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-path-to-node=\"3\">Gaining insight into your <b data-path-to-node=\"3\" data-index-in-node=\"26\">CYP3A5 profile<\/b> is medically essential when using specific, high-stakes medications where maintaining the correct blood concentration is critical:<\/p>\n<ul>\n<li data-path-to-node=\"4,0,0\"><b data-path-to-node=\"4,0,0\" data-index-in-node=\"0\">Optimal Dosing of Immunosuppressants:<\/b> For drugs such as tacrolimus (commonly used after transplants), the CYP3A5 enzyme largely determines the required dosage. &#8216;Expressors&#8217; often require significantly higher doses than &#8216;non-expressors&#8217; to prevent organ rejection.<\/li>\n<li data-path-to-node=\"4,1,0\"><b data-path-to-node=\"4,1,0\" data-index-in-node=\"0\">Preventing Toxicity:<\/b> If you are a &#8216;non-expressor&#8217; (slow metabolism) and receive a standard dose based on the population average, your blood levels can become dangerously high. This increases the risk of severe side effects and kidney damage.<\/li>\n<li data-path-to-node=\"4,2,0\"><b data-path-to-node=\"4,2,0\" data-index-in-node=\"0\">Effectiveness of Chemotherapy:<\/b> Certain oncology-related drugs are metabolized by this enzyme; overly rapid metabolism can undermine the overall effectiveness of the treatment.<\/li>\n<\/ul>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-c9edefa elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"c9edefa\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-373656e\" data-id=\"373656e\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3455595 elementor-widget elementor-widget-heading\" data-id=\"3455595\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Medications influenced by CYP3A5<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6d95732 elementor-widget elementor-widget-text-editor\" data-id=\"6d95732\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-path-to-node=\"0\">The functioning of CYP3A5 is particularly critical for the following agents:<\/p>\n<ul>\n<li data-path-to-node=\"1,0,0\"><b data-path-to-node=\"1,0,0\" data-index-in-node=\"0\">Immunosuppressants:<\/b> including Tacrolimus (Prograf, Advagraf), Cyclosporine, and Sirolimus.<\/li>\n<li data-path-to-node=\"1,1,0\"><b data-path-to-node=\"1,1,0\" data-index-in-node=\"0\">Oncology:<\/b> including Vincristine and Cyclophosphamide.<\/li>\n<li data-path-to-node=\"1,2,0\"><b data-path-to-node=\"1,2,0\" data-index-in-node=\"0\">Statins (Cholesterol-lowering drugs):<\/b> including Atorvastatin and Simvastatin (in conjunction with CYP3A4).<\/li>\n<li data-path-to-node=\"1,3,0\"><b data-path-to-node=\"1,3,0\" data-index-in-node=\"0\">Antihypertensives (Blood pressure medication):<\/b> including Nifedipine and Felodipine.<\/li>\n<li data-path-to-node=\"1,4,0\"><b data-path-to-node=\"1,4,0\" data-index-in-node=\"0\">Antifungals:<\/b> including Voriconazole.<\/li>\n<\/ul>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-b732c90 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b732c90\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-60d580b\" data-id=\"60d580b\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6db9a08 elementor-widget elementor-widget-heading\" data-id=\"6db9a08\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Interpretation of your CYP3A5 status<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-75c5636 elementor-widget elementor-widget-text-editor\" data-id=\"75c5636\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div id=\"model-response-message-contentr_bc5ce8f5ee26d451\" class=\"markdown markdown-main-panel stronger enable-updated-hr-color preserve-whitespaces-in-response\" dir=\"ltr\" aria-live=\"polite\" aria-busy=\"false\">\n<p data-path-to-node=\"0\">Based on your DNA, it is determined whether you are an &#8216;Expressor&#8217; or a &#8216;Non-expressor&#8217;. This status dictates how your body responds to the aforementioned medication:<\/p>\n<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fdeeba2 elementor-widget elementor-widget-shortcode\" data-id=\"fdeeba2\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\">\n<table id=\"tablepress-195\" class=\"tablepress tablepress-id-195 biomarker-table\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">Result<\/th><th class=\"column-2\">Interpretatie<\/th><th class=\"column-3\">Interpretation<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"row-2\">\n\t<td class=\"column-1\">PM<\/td><td class=\"column-2\">Poor Metabolizer <br \/>\n(Non-expressor)<\/td><td class=\"column-3\">The enzyme is inactive. This is the case for most Europeans. You have an increased risk of side effects with standard doses of specific medications.<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">IM<\/td><td class=\"column-2\">Intermediate Metabolizer<\/td><td class=\"column-3\">The enzyme exhibits limited activity. Medication processing is slower than average, often requiring careful dosing.<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">NM<\/td><td class=\"column-2\">Normal Metabolizer<br \/>\n(Expressor)<\/td><td class=\"column-3\">The enzyme is active and functioning normally. Certain medications (such as tacrolimus) are broken down more quickly, so a higher dose is often required for effectiveness.<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">UM<\/td><td class=\"column-2\">Ultrarapid Metabolizer<\/td><td class=\"column-3\">The enzyme works extremely quickly. Medication is removed from the body very quickly, which increases the risk of insufficient effectiveness of the therapy.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-195 from cache --><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-40384e4 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"40384e4\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-f040f35\" data-id=\"f040f35\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-e24715d elementor-widget elementor-widget-heading\" data-id=\"e24715d\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Medical interpretation &amp; advice<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a792218 elementor-widget elementor-widget-text-editor\" data-id=\"a792218\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div id=\"model-response-message-contentr_8ac53b3aeb40740b\" class=\"markdown markdown-main-panel stronger enable-updated-hr-color preserve-whitespaces-in-response\" dir=\"ltr\" aria-live=\"polite\" aria-busy=\"false\">\n<p data-path-to-node=\"0\">The results of your Easly test are cross-referenced with the official medication guidelines of the <b data-path-to-node=\"0\" data-index-in-node=\"99\">KNMP (G-Standaard)<\/b>. This provides you, your pharmacist, and your physician with a scientific foundation for a tailored treatment plan.<\/p>\n<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2c02e71 elementor-widget elementor-widget-text-editor\" data-id=\"2c02e71\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div id=\"model-response-message-contentr_f60e92d551fc1f32\" class=\"markdown markdown-main-panel stronger enable-updated-hr-color preserve-whitespaces-in-response\" dir=\"ltr\" aria-live=\"polite\" aria-busy=\"false\">\n<p data-path-to-node=\"0\"><strong>Important: Always use this result in consultation with your treating physician or pharmacist. Never adjust your dosage independently.<\/strong> Based on your profile, a physician or pharmacist may decide to optimize the dose or switch to a medication that does not depend on this specific enzyme.<\/p>\n<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t<div class=\"elementor-element elementor-element-7f95315 e-flex e-con-boxed e-con e-parent\" data-id=\"7f95315\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f345a2b elementor-widget elementor-widget-image\" data-id=\"f345a2b\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.easly.nl\/en\/dna-passport-for-medication\/\">\n\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1260\" height=\"460\" src=\"https:\/\/www.easly.nl\/wp-content\/uploads\/sites\/13\/2026\/02\/Farmaco-biomarker-banner-1.png\" class=\"attachment-full size-full wp-image-69003\" alt=\"Farmaco biomarker banner\" srcset=\"https:\/\/www.easly.nl\/wp-content\/uploads\/sites\/13\/2026\/02\/Farmaco-biomarker-banner-1.png 1260w, https:\/\/www.easly.nl\/wp-content\/uploads\/sites\/13\/2026\/02\/Farmaco-biomarker-banner-1-300x110.png 300w, https:\/\/www.easly.nl\/wp-content\/uploads\/sites\/13\/2026\/02\/Farmaco-biomarker-banner-1-1024x374.png 1024w, https:\/\/www.easly.nl\/wp-content\/uploads\/sites\/13\/2026\/02\/Farmaco-biomarker-banner-1-768x280.png 768w, https:\/\/www.easly.nl\/wp-content\/uploads\/sites\/13\/2026\/02\/Farmaco-biomarker-banner-1-804x294.png 804w, https:\/\/www.easly.nl\/wp-content\/uploads\/sites\/13\/2026\/02\/Farmaco-biomarker-banner-1-1044x381.png 1044w\" sizes=\"(max-width: 1260px) 100vw, 1260px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-a409825 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"a409825\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-6b26a94\" data-id=\"6b26a94\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-753cde6 elementor-widget elementor-widget-text-editor\" data-id=\"753cde6\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Do you want to know if your symptoms can be explained by your DNA profile? Take the free <a href=\"https:\/\/www.easly.nl\/en\/dna-paspoort-test-online\/\"><b data-path-to-node=\"1\" data-index-in-node=\"89\">Pharmacogenetic Quickscan<\/b><\/a> (Dutch only) and receive immediate clarity on whether a test would be beneficial for you.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a6efc64 elementor-align-center elementor-widget elementor-widget-button\" data-id=\"a6efc64\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/www.easly.nl\/en\/dna-paspoort-test-online\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Start the Quick Scan<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>CYP3A5 is a genetically determined enzyme in the liver that is crucial for the rate at which specific medications, such as immunosuppressants and chemotherapy, are broken down and cleared from the body.<\/p>\n","protected":false},"template":"","biomarkers_category":[2233],"class_list":["post-69098","biomarkers","type-biomarkers","status-publish","hentry","biomarkers_category-pharmacogenetics"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.3 - 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