{"id":26079,"date":"2025-12-10T11:52:38","date_gmt":"2025-12-10T19:52:38","guid":{"rendered":"https:\/\/dornsife.usc.edu\/news\/?p=26079"},"modified":"2026-03-04T16:50:12","modified_gmt":"2026-03-05T00:50:12","slug":"how-does-narcan-work","status":"publish","type":"post","link":"https:\/\/dornsife.usc.edu\/news\/stories\/how-does-narcan-work\/","title":{"rendered":"How does Narcan work?"},"content":{"rendered":"\n\n\n    \n                                          \n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--article-hero \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--article-hero\"\n    \n      >\n\n    \n<div class=\"inner-wrapper\">\n          \n<div class=\"f--field f--image\">\n\n    \n    \n    \n    \n    \n    \n              \n      <img\n                            data-src=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2025\/12\/kahn-naloxone-top-768x432.jpg\"\n          data-srcset=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2025\/12\/kahn-naloxone-top-1920x1080.jpg 1920w,https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2025\/12\/kahn-naloxone-top-1280x720.jpg 1280w,https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2025\/12\/kahn-naloxone-top-768x432.jpg 768w\"          data-sizes=\"(min-width:1200px) 75vw, (min-width:768px) 83vw, 100vw\"          class=\"lazyload\"\n        \n                  alt=\"Photo of a canister of Narcan and its packaging.\"\n        \n        \n                                      \/>\n\n    \n    \n  \n  \n\n<\/div>\n  \n      <div class=\"image-caption\">\n          \n<div class=\"f--field f--description\">\n\n    \n  Naloxone competes with opioids for the same receptor on the surface of neurons. (Image Source: Unsplash.)\n\n\n<\/div>\n    <\/div>\n  \n  <div class=\"text-wrapper\">\n          <nav aria-label=\"Breadcrumb\" class=\"breadcrumbs\">\n        <ul>\n                      <li><a href=\"\/news\/stories\/\">News<\/a><\/li>\n                      <li><a href=\"\/news\/stories\/\/?category=health\">Health<\/a><\/li>\n                  <\/ul>\n      <\/nav>\n    \n              \n<div class=\"f--field f--page-title\">\n\n    \n  <h1>How does Narcan work?<\/h1>\n\n\n<\/div>\n    \n          <div class=\"subtitle\">\n            \n<div class=\"f--field f--description\">\n\n    \n  New mapping reveals how naloxone reverses opioid overdose, providing a molecular blueprint for more effective drugs.\n\n\n<\/div>\n      <\/div>\n    \n           <strong class=\"author-field\"><span >By<\/span><a href=\"mailto:communication@usc.edu\">Saif Khan<\/a><\/strong>\n    \n          <span class=\"post-date-field\">December 10, 2025<\/span>\n      <\/div>\n<\/div>\n\n\n  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class=\"theconversation-article-title\"><a href=\"https:\/\/magazine.medlineplus.gov\/article\/how-naloxone-reverses-opioid-overdoses-and-why-its-important-to-have-on-hand\/\" target=\"_blank\" rel=\"noopener\">Naloxone, also known by the brand name Narcan<\/a>, is one of the most important drugs in the United States\u2019 fight against the opioid crisis. It reverses an opioid overdose nearly instantly, restarting breathing in a person who was unresponsive moments before and on the brink of death. To bystanders witnessing it being administered, naloxone can appear almost supernatural.<\/p>\n<div class=\"theconversation-article-body\">\n<p>Although the Food and Drug Administration <a href=\"https:\/\/pubchem.ncbi.nlm.nih.gov\/compound\/Naloxone\" target=\"_blank\" rel=\"noopener\">approved naloxone for medical use in 1971<\/a> and for <a href=\"https:\/\/theconversation.com\/fda-approval-of-over-the-counter-narcan-is-an-important-step-in-the-effort-to-combat-the-us-opioid-crisis-198497\" target=\"_blank\" rel=\"noopener\">over-the-counter purchase in 2023<\/a>, exactly how it works is still unclear. Researchers know naloxone acts on <a href=\"https:\/\/theconversation.com\/your-body-naturally-produces-opioids-without-causing-addiction-or-overdose-studying-how-this-process-works-could-help-reduce-the-side-effects-of-opioid-drugs-204522\" target=\"_blank\" rel=\"noopener\">opioid receptors<\/a>, a family of proteins responsible for the body\u2019s response to pain. When opioids such as morphine <a href=\"https:\/\/theconversation.com\/what-is-fentanyl-and-why-is-it-behind-the-deadly-surge-in-us-drug-overdoses-a-medical-toxicologist-explains-182629\" target=\"_blank\" rel=\"noopener\">and fentanyl<\/a> bind to these receptors, they produce not only pain relief and euphoria but also dangerous side effects. Naloxone competes with opioids for access to these receptors, preventing the drugs from triggering effects in the body. How it does this at the molecular level, however, has been an ongoing question.<\/p>\n<p>In our recently published research in the journal Nature, my team and I were able to provide some definitive evidence of how naloxone works by <a href=\"https:\/\/doi.org\/10.1038\/s41586-025-09677-6\" target=\"_blank\" rel=\"noopener\">capturing images of it in action<\/a> for the first time.<\/p>\n<div class=\"video-embed\"><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/2CM6kgzRxyc?si=JA9lPLcomX_qkSCG\" title=\"You can help reverse the overdose epidemic\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<h2>Biology of opioids<\/h2>\n<p>To better grasp how naloxone works, it\u2019s helpful to first zoom in on the biology behind opioids.<\/p>\n<p>One member of the family of opioid receptors, <a href=\"https:\/\/medlineplus.gov\/genetics\/gene\/oprm1\/\" target=\"_blank\" rel=\"noopener\">MOR \u2014 short for \u00b5-opioid receptor<\/a> \u2014 is a central player in regulating the body\u2019s response to pain. It sits on the surface of neurons, mostly in the brain and spinal cord, and acts as a communication hub.<\/p>\n<p>When an opioid \u2014 <a href=\"https:\/\/doi.org\/10.1124\/mol.120.119388\" target=\"_blank\" rel=\"noopener\">such as an endorphin<\/a>, the body\u2019s natural painkillers \u2014 interacts with MOR, it <a href=\"https:\/\/doi.org\/10.1073\/pnas.2420623122\" target=\"_blank\" rel=\"noopener\">changes the structure of the receptor<\/a>. This change in shape allows what\u2019s called a G protein to bind to the receptor and trigger a signal to the rest of the body to reduce pain, induce pleasure, or \u2014 in the case of overdose \u2014 dangerously slow breathing and heart rate.<\/p>\n<figure class=\"align-right zoomable\">\n<p><figure style=\"width: 429px\" class=\"wp-caption alignright\"><a href=\"https:\/\/images.theconversation.com\/files\/703749\/original\/file-20251120-56-8a21lr.png?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/images.theconversation.com\/files\/703749\/original\/file-20251120-56-8a21lr.png?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=237&amp;fit=clip\" sizes=\"(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px\" srcset=\"https:\/\/images.theconversation.com\/files\/703749\/original\/file-20251120-56-8a21lr.png?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=600&amp;h=815&amp;fit=crop&amp;dpr=1 600w, https:\/\/images.theconversation.com\/files\/703749\/original\/file-20251120-56-8a21lr.png?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=600&amp;h=815&amp;fit=crop&amp;dpr=2 1200w, https:\/\/images.theconversation.com\/files\/703749\/original\/file-20251120-56-8a21lr.png?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=600&amp;h=815&amp;fit=crop&amp;dpr=3 1800w, https:\/\/images.theconversation.com\/files\/703749\/original\/file-20251120-56-8a21lr.png?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;h=1024&amp;fit=crop&amp;dpr=1 754w, https:\/\/images.theconversation.com\/files\/703749\/original\/file-20251120-56-8a21lr.png?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=754&amp;h=1024&amp;fit=crop&amp;dpr=2 1508w, https:\/\/images.theconversation.com\/files\/703749\/original\/file-20251120-56-8a21lr.png?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=754&amp;h=1024&amp;fit=crop&amp;dpr=3 2262w\" alt=\"Diagram of different configurations of MOR\" width=\"429\" height=\"583\" \/><\/a><figcaption class=\"wp-caption-text\">When a molecule binds to the \u00b5-opioid receptor, it changes its structure and elicits an effect. Antagonists like naloxone inactivate the \u00b5-opioid receptor, while agonists like fentanyl activate it. (Bensaccount\/Wikimedia Commons)<\/figcaption><\/figure><figcaption><\/figcaption><\/figure>\n<p>In everyday terms, MOR is like a lock on the outside of the cell. The G protein is the mechanism inside the lock that turns when the correct key \u2014 in this case, an endorphin or a drug like fentanyl \u2014 goes in. For decades, scientists believed that an opioid\u2019s ability to enable this signaling cascade was linked to how effectively it reshaped the structure of the receptor \u2014 essentially, whether the lock could open wide enough for the internal mechanism of the G-protein to engage.<\/p>\n<p>Yet, recent research \u2014 including our work \u2014 has revealed that the critical step to how opioids work is not how wide they open the lock but how well the mechanism works. <a href=\"https:\/\/doi.org\/10.1017\/qrd.2021.7\" target=\"_blank\" rel=\"noopener\">G proteins act like a switch<\/a>, releasing one molecule in exchange for another molecule that triggers the protein to send the signal that sets off opioid effects.<\/p>\n<p>In essence, drugs like fentanyl, by acting on the receptor, transmit physical changes to G proteins that result in the switch flipping more rapidly. What we now see is that <a href=\"https:\/\/doi.org\/10.1038\/s41586-025-09677-6\" target=\"_blank\" rel=\"noopener\">naloxone jams the mechanism<\/a>, preventing the switch from flipping and sending the signal.<\/p>\n<h2>Capturing the switch<\/h2>\n<p>Researchers know that the effects of opioids are triggered when the G protein switch is flipped. But what does this process look like?<\/p>\n<p>For years, attempts to visualize this mechanism were largely limited to two states \u2014 before the G protein binds to the \u00b5-opioid receptor, and after the molecule was released from the G protein. The states in between were considered too unstable to isolate. My team and I wanted to capture these unseen states moment by moment as the switch flips and the molecule is released.<\/p>\n<p>To do this, we used a technique called <a href=\"https:\/\/theconversation.com\/visualizing-the-inside-of-cells-at-previously-impossible-resolutions-provides-vivid-insights-into-how-they-work-195873\" target=\"_blank\" rel=\"noopener\">cryo-electron microscopy<\/a>, which freezes molecules in motion to visualize them at near-atomic resolution. For both naloxone and the opioid drug loperamide (Imodium), we trapped the G protein bound to the opioid receptor right before it released the molecule.<\/p>\n<p>We <a href=\"https:\/\/doi.org\/10.1038\/s41586-025-09677-6\" target=\"_blank\" rel=\"noopener\">captured four distinct structural states<\/a> leading up to the release of the molecule from the G protein.<\/p>\n<p>The first of these, which we call the latent state, is the earliest form of the opioid receptor and G protein after they make contact. We found that both the opioid receptor and the G protein are inactive at this point. Moreover, naloxone stabilizes this latent state. What this means is that <a href=\"https:\/\/doi.org\/10.1038\/s41586-025-09677-6\" target=\"_blank\" rel=\"noopener\">naloxone effectively jams the mechanism<\/a> right at the start, preventing all subsequent steps required for activation.<\/p>\n<figure class=\"align-center zoomable\"><a href=\"https:\/\/images.theconversation.com\/files\/703747\/original\/file-20251120-56-prkcrw.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip\"><img decoding=\"async\" src=\"https:\/\/images.theconversation.com\/files\/703747\/original\/file-20251120-56-prkcrw.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip\" sizes=\"(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px\" srcset=\"https:\/\/images.theconversation.com\/files\/703747\/original\/file-20251120-56-prkcrw.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=600&amp;h=163&amp;fit=crop&amp;dpr=1 600w, https:\/\/images.theconversation.com\/files\/703747\/original\/file-20251120-56-prkcrw.jpg?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=600&amp;h=163&amp;fit=crop&amp;dpr=2 1200w, https:\/\/images.theconversation.com\/files\/703747\/original\/file-20251120-56-prkcrw.jpg?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=600&amp;h=163&amp;fit=crop&amp;dpr=3 1800w, https:\/\/images.theconversation.com\/files\/703747\/original\/file-20251120-56-prkcrw.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;h=205&amp;fit=crop&amp;dpr=1 754w, https:\/\/images.theconversation.com\/files\/703747\/original\/file-20251120-56-prkcrw.jpg?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=754&amp;h=205&amp;fit=crop&amp;dpr=2 1508w, https:\/\/images.theconversation.com\/files\/703747\/original\/file-20251120-56-prkcrw.jpg?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=754&amp;h=205&amp;fit=crop&amp;dpr=3 2262w\" alt=\"Diagram of MOR and G protein in six different states of activation\" \/><\/a><figcaption><span class=\"caption\">How the \u00b5-opioid receptor (top half of the structure) and G protein (bottom half of the structure) are configured is key to the effects of naloxone and opioids.<\/span><br \/>\n<span class=\"attribution\"><a class=\"source\" href=\"https:\/\/doi.org\/10.1038\/s41586-025-09677-6\" target=\"_blank\" rel=\"noopener\">Saif Khan et al\/Nature<\/a>, <a class=\"license\" href=\"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/\" target=\"_blank\" rel=\"noopener\">CC BY-NC-ND<\/a><\/span><\/figcaption><\/figure>\n<p>In the absence of naloxone, an opioid drug promotes a transition to the remaining three states: The G-protein rotates and aligns itself with the receptor (engaged), swings open the door blocking the molecule that would trigger the switch from flipping (unlatched), and holds that door open so the molecule can be released (primed) and send the signal to carry out the drug\u2019s effects.<\/p>\n<p>To confirm that our snapshots reflect what\u2019s really happening, we performed extensive computational simulations to watch these four states change over time. Together, these findings point to the molecular root of naloxone\u2019s therapeutic effects: By stalling the opioid receptor and G protein at a latent state, it <a href=\"https:\/\/doi.org\/10.1038\/s41586-025-09677-6\" target=\"_blank\" rel=\"noopener\">shuts down opioid signaling<\/a>, reversing an opioid overdose within minutes.<\/p>\n<h2>Visualizing new drugs<\/h2>\n<p>Designing a new key for a lock is most successfully done when you <a href=\"https:\/\/theconversation.com\/90-of-drugs-fail-clinical-trials-heres-one-way-researchers-can-select-better-drug-candidates-174152\" target=\"_blank\" rel=\"noopener\">know exactly what that lock looks like<\/a>. By mapping the exact sequence of how opioids interact with opioid receptors and pinpointing where different drugs can intervene in this process, our findings provide a blueprint for engineering the next generation of opioid medicines and overdose antidotes.<\/p>\n<p>For example, one of the persistent challenges with naloxone is that it must often be <a href=\"https:\/\/doi.org\/10.1001\/jamanetworkopen.2023.51839\" target=\"_blank\" rel=\"noopener\">administered repeatedly during an overdose<\/a>. This is especially the case for fentanyl overdoses, where the opioid can outcompete or outlast the effects of the treatment.<\/p>\n<p>Knowing that naloxone works by stalling the \u00b5-opioid receptor in an early, latent state suggests that molecules that can bind more tightly or more selectively to this form of the receptor could be more effective at stabilizing this inactive state and thus preventing an opioid\u2019s effects.<\/p>\n<p>By uncovering the structure of molecules involved in opioid signaling, researchers may be able to develop drugs that provide longer-lasting protection against overdose.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img loading=\"lazy\" decoding=\"async\" style=\"border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;\" src=\"https:\/\/counter.theconversation.com\/content\/269706\/count.gif?distributor=republish-lightbox-basic\" alt=\"The Conversation\" width=\"1\" height=\"1\" \/><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https:\/\/theconversation.com\/republishing-guidelines --><\/p>\n<p><a href=\"https:\/\/theconversation.com\/profiles\/saif-khan-2523944\">Saif Khan<\/a>, Ph.D. Candidate in <a href=\"https:\/\/dornsife.usc.edu\/bisc\/\">Biology<\/a>, <em><a href=\"https:\/\/theconversation.com\/institutions\/usc-dornsife-college-of-letters-arts-and-sciences-2669\">USC Dornsife College of Letters, Arts and Sciences<\/a><\/em><\/p>\n<p>This article is republished from <a href=\"https:\/\/theconversation.com\" target=\"_blank\" rel=\"noopener\">The Conversation<\/a> under a Creative Commons license. Read the <a href=\"https:\/\/theconversation.com\/how-does-narcan-work-mapping-how-it-reverses-opioid-overdose-can-provide-a-molecular-blueprint-for-more-effective-drugs-269706\" target=\"_blank\" rel=\"noopener\">original article<\/a>.<\/p>\n<\/div>\n\n\n\n<\/div>\n\n\n  <\/div><\/div>\n\n\n\n  \n        \n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--article-related-stories \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--article-related-stories\"\n    \n      >\n\n    \n  <div class=\"inner-wrapper\">\n              \n<div class=\"f--field f--section-title\">\n\n    \n  <h2>\n          Related Articles\n      <\/h2>\n\n\n<\/div>\n    \n                  <article>\n              \n<div class=\"f--field f--cta-title\">\n\n    \n  <h3>\n          <a href=\"https:\/\/dornsife.usc.edu\/news\/stories\/the-sixth-taste\/\" \n                        class=\"\" \n      >And then there were 6 \u2014 kinds of taste, that is<\/a>\n      <\/h3>\n\n\n<\/div>\n        <\/article>\n              <article>\n              \n<div class=\"f--field f--cta-title\">\n\n    \n  <h3>\n          <a href=\"https:\/\/dornsife.usc.edu\/news\/stories\/could-a-simple-blood-test-detect-cancer\/\" \n                        class=\"\" \n      >Could a simple blood test detect cancer?<\/a>\n      <\/h3>\n\n\n<\/div>\n        <\/article>\n              <article>\n              \n<div class=\"f--field f--cta-title\">\n\n    \n  <h3>\n          <a href=\"https:\/\/dornsife.usc.edu\/news\/stories\/artificial-sweeteners-for-weight-loss\/\" \n                        class=\"\" \n      >WHO\u2019s recommendation against the use of artificial sweeteners for weight loss leaves many questions unanswered<\/a>\n      <\/h3>\n\n\n<\/div>\n        <\/article>\n            <\/div>\n\n\n  <\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>New mapping reveals how naloxone reverses opioid overdose, providing a molecular blueprint for more effective drugs.<\/p>\n","protected":false},"author":14,"featured_media":26084,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[26,16],"tags":[117,87,206,60,83],"class_list":["post-26079","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-health","category-science-and-technology","tag-biology","tag-expert-viewpoint","tag-molecular-and-computational-biology","tag-research","tag-the-conversation"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How does Narcan work?<\/title>\n<meta name=\"description\" content=\"New mapping reveals how naloxone reverses opioid overdose, providing a molecular blueprint for more effective drugs.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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