{"id":10152,"date":"2026-06-15T00:06:59","date_gmt":"2026-06-15T08:06:59","guid":{"rendered":"https:\/\/www.osmosis.org\/blog\/?p=10152"},"modified":"2026-05-29T16:06:51","modified_gmt":"2026-05-30T00:06:51","slug":"usmle-step-1-question-of-the-day-vortioxetine-interaction","status":"publish","type":"post","link":"https:\/\/www.osmosis.org\/blog\/usmle-step-1-question-of-the-day-vortioxetine-interaction","title":{"rendered":"USMLE\u00ae Step 1 Question of the Day:\u00a0Vortioxetine interaction"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_80 ez-toc-wrap-center counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">In This Article<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.osmosis.org\/blog\/usmle-step-1-question-of-the-day-vortioxetine-interaction\/#The_correct_answer_to_todays_USMLE%C2%AE_Step_1_Question_is%E2%80%A6\" >The correct answer to today\u2019s USMLE\u00ae Step 1 Question is\u2026<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.osmosis.org\/blog\/usmle-step-1-question-of-the-day-vortioxetine-interaction\/#Incorrect_Answer_Explanations\" >Incorrect Answer Explanations<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.osmosis.org\/blog\/usmle-step-1-question-of-the-day-vortioxetine-interaction\/#Main_Explanation\" >Main Explanation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.osmosis.org\/blog\/usmle-step-1-question-of-the-day-vortioxetine-interaction\/#Major_Takeaway\" >Major Takeaway&nbsp;<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.osmosis.org\/blog\/usmle-step-1-question-of-the-day-vortioxetine-interaction\/#Want_to_learn_more_about_this_topic\" >Want to learn more about this topic?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.osmosis.org\/blog\/usmle-step-1-question-of-the-day-vortioxetine-interaction\/#References\" >References<\/a><\/li><\/ul><\/nav><\/div>\n\n<p class=\"wp-block-paragraph\"><em><strong>Today\u2019s USMLE\u00ae Step 1 question of the day features a young man with acute agitation, hyperthermia, and muscle rigidity after a recent antidepressant change. What\u2019s the underlying cause of his presentation? Let\u2019s find out!<\/strong><\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A 25-year-old man presents to the emergency department in an incoherent state with flushing, agitation, muscle rigidity, and hyperthermia. Intravenous lorazepam is started, which reduces the patient\u2019s muscle rigidity. However, within 30 minutes, the patient becomes unresponsive and comatose. Intravenous cyproheptadine is started, which eventually helps the patient recover. On obtaining a prescription history, it is noted that the patient had been taking fluoxetine and recently switched to vortioxetine. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Which of the following explains the underlying cause of this patient\u2019s symptoms?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A. Excessive dopamine<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B. Excessive serotonin<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>C. Deficiency of norepinephrine<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>D. Deficiency of dopamine<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>E. Deficiency of serotonin<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\"><em>Scroll down for the correct answer!<\/em><\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Osmosis.org at the University College London, UK\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/DIp3u0oTLo4?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The_correct_answer_to_todays_USMLE%C2%AE_Step_1_Question_is%E2%80%A6\"><\/span>The correct answer to today\u2019s USMLE\u00ae Step 1 Question is\u2026<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B. Excessive serotonin<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Correct:<\/strong> See Main Explanation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Incorrect_Answer_Explanations\"><\/span>Incorrect Answer Explanations<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A. Excessive dopamine<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Incorrect:<\/strong> Excessive dopaminergic activity is linked to schizophrenia, hallucinogenic symptoms, and mania. This patient is exhibiting symptoms of serotonin syndrome.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>C. Deficiency of norepinephrine<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Incorrect:<\/strong> Low levels of norepinephrine are associated with lethargy, lack of concentration, attention deficit hyperactivity disorder, and depression. In contrast, this patient\u2019s symptoms are more consistent with serotonin syndrome.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>D. Deficiency of dopamine<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Incorrect:<\/strong> This answer choice describes the underlying pathology of Parkinson disease. In contrast, this patient\u2019s symptoms are more suggestive of serotonin syndrome, which is caused by excessive serotonin release.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>E. Deficiency of serotonin<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Incorrect:<\/strong> A deficiency of serotonin is linked to symptoms of depression. This patient is suffering from serotonin syndrome, which is due to an excess of serotonergic activity.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Main_Explanation\"><\/span>Main Explanation<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This patient\u2019s symptoms of flushing, agitation, muscle rigidity, hyperthermia, and altered mental status are characteristic of serotonin syndrome. <strong>Serotonin syndrome arises from an excess of serotonergic potentiation, which can arise from excessive use of antidepressants or drugs that increase serotonin levels. Serotonin syndrome arises within 24-hours of medication use and typically resolves within 24-hours after its discontinuation.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Two antidepressants, namely vortioxetine and vilazodone, have been associated with serotonin syndrome due to their powerful effects in increasing serotonin levels.<\/strong> They exert this effect via two mechanisms: 1) inhibition of serotonin reuptake transporters, and 2) partial agonism of 5-HT1A receptors (in vilazodone) or full agonism of 5-HT1A receptors (in vortioxetine). The combined action of these mechanisms creates a potent antidepressant effect.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>To treat serotonin syndrome, cyproheptadine, a 5-HT2A blocker, should be administered. <\/strong>It is important to distinguish serotonin syndrome from other conditions with similar presentations, reference the table below.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Major_Takeaway\"><\/span>Major Takeaway&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Serotonin syndrome is characterized by altered mental status, muscle rigidity, hyperreflexia, and hyperthermia. It can be precipitated by antidepressants such as vortioxetine and vilazodone. The condition can be potentially life-threatening and should be treated promptly with cyproheptadine.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Want_to_learn_more_about_this_topic\"><\/span>Want to learn more about this topic?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Watch this Osmosis video:<\/strong> <strong><a href=\"https:\/\/www.osmosis.org\/learn\/Atypical_antidepressants\">Atypical antidepressants<\/a><\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"References\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Volpi-Abadie, J., Kaye, A.M., Kaye, A.D. (2013) <strong>Serotonin syndrome<\/strong>. The Ochsner Journal. 13(4), 533-540. PMID: 24358002.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\"><\/ul>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"250\" src=\"https:\/\/www.osmosis.org\/blog\/wp-content\/uploads\/sites\/2\/2025\/01\/Blog_Display_Ads_GENERAL2_2023.png?w=700\" alt=\"\" class=\"wp-image-5098\" srcset=\"https:\/\/www.osmosis.org\/blog\/wp-content\/uploads\/sites\/2\/2025\/01\/Blog_Display_Ads_GENERAL2_2023.png 700w, https:\/\/www.osmosis.org\/blog\/wp-content\/uploads\/sites\/2\/2025\/01\/Blog_Display_Ads_GENERAL2_2023.png?resize=300,107 300w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>Want more USMLE\u00ae Step 1 practice questions? <\/em><\/strong><em>Try <\/em><strong><em>Osmosis from Elsevier <\/em><\/strong><em>today! <\/em><strong><em>Access your <a href=\"http:\/\/osmosis.org\/create\">free trial<\/a> <\/em><\/strong><em>and discover why millions of current and future<\/em><strong><em> clinicians and caregivers love learning by Osmosis.<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A young patient develops rapid-onset agitation, hyperthermia, and rigidity after a medication change. Can you identify the underlying mechanism behind this high-yield clinical scenario?<\/p>\n","protected":false},"author":208,"featured_media":10155,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[27,20,16,1366,1369,44],"tags":[3109,2945,2967,2815,3108,2371,440,84,458,3115,462,261,221,650,664],"class_list":["post-10152","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-medicine","category-exam-prep","category-do","category-questions","category-step-1-questions","category-step-1","tag-adverse-drug-reactions","tag-antidepressants","tag-board-exam-prep","tag-case-study","tag-clinical-vignette","tag-drug-toxicity","tag-emergency-medicine","tag-medical-education","tag-mental-health","tag-neurochemistry","tag-osmosis","tag-pharmacology","tag-psychiatry","tag-serotonin-syndrome","tag-usmle-step-1"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>USMLE\u00ae Step 1 Question of the Day:\u00a0Vortioxetine interaction - Osmosis Blog<\/title>\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.osmosis.org\/blog\/usmle-step-1-question-of-the-day-vortioxetine-interaction\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"USMLE\u00ae Step 1 Question of the Day:\u00a0Vortioxetine interaction - Osmosis Blog\" \/>\n<meta property=\"og:description\" content=\"A young patient develops rapid-onset agitation, hyperthermia, and rigidity after a medication change. 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