{"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":"<h2>What is CYP3A5?<\/h2>\n<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<h2>Why test your CYP3A5 status?<\/h2>\n<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<h2>Medications influenced by CYP3A5<\/h2>\n<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<h2>Interpretation of your CYP3A5 status<\/h2>\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\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 -->\n<h2>Medical interpretation &amp; advice<\/h2>\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<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<p>\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\/\"><br \/>\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\" 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><\/p>\n<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<p>\t\t\t\t\t<a href=\"https:\/\/www.easly.nl\/en\/dna-paspoort-test-online\/\"><br \/>\n\t\t\t\t\t\t\t\t\tStart the Quick Scan<br \/>\n\t\t\t\t\t<\/a><\/p>\n","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 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>CYP3A5 - Easly<\/title>\n<meta name=\"description\" content=\"Discover how your CYP3A5 gene influences the effects of medications like tacrolimus and prevent side effects by understanding your personal DNA profile.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.easly.nl\/en\/biomarkers\/cyp3a5\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CYP3A5 - Easly\" \/>\n<meta property=\"og:description\" content=\"Discover how your CYP3A5 gene influences the effects of medications like tacrolimus and prevent side effects by understanding your personal DNA profile.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.easly.nl\/en\/biomarkers\/cyp3a5\/\" \/>\n<meta property=\"og:site_name\" content=\"Easly Shop\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-24T10:13:28+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.easly.nl\/wp-content\/uploads\/sites\/13\/2026\/02\/Farmaco-biomarker-banner-1.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.easly.nl\/en\/biomarkers\/cyp3a5\/\",\"url\":\"https:\/\/www.easly.nl\/en\/biomarkers\/cyp3a5\/\",\"name\":\"CYP3A5 - Easly\",\"isPartOf\":{\"@id\":\"https:\/\/www.easly.nl\/en\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.easly.nl\/en\/biomarkers\/cyp3a5\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.easly.nl\/en\/biomarkers\/cyp3a5\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.easly.nl\/wp-content\/uploads\/sites\/13\/2026\/02\/Farmaco-biomarker-banner-1.png\",\"datePublished\":\"2026-02-24T08:36:27+00:00\",\"dateModified\":\"2026-02-24T10:13:28+00:00\",\"description\":\"Discover how your CYP3A5 gene influences the effects of medications like tacrolimus and prevent side effects by understanding your personal DNA profile.\",\"breadcrumb\":{\"@id\":\"https:\/\/www.easly.nl\/en\/biomarkers\/cyp3a5\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.easly.nl\/en\/biomarkers\/cyp3a5\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.easly.nl\/en\/biomarkers\/cyp3a5\/#primaryimage\",\"url\":\"https:\/\/www.easly.nl\/wp-content\/uploads\/sites\/13\/2026\/02\/Farmaco-biomarker-banner-1.png\",\"contentUrl\":\"https:\/\/www.easly.nl\/wp-content\/uploads\/sites\/13\/2026\/02\/Farmaco-biomarker-banner-1.png\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.easly.nl\/en\/biomarkers\/cyp3a5\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.easly.nl\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Biomarkers\",\"item\":\"https:\/\/www.easly.nl\/en\/biomarkers\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"CYP3A5\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.easly.nl\/en\/#website\",\"url\":\"https:\/\/www.easly.nl\/en\/\",\"name\":\"Easly Shop\",\"description\":\"Safe &amp; 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