• Kazuki Sugaya, Tomotaka Misawa, Makoto Onodera, and Ken Iseki.
• Department of Emergency Medicine, Fukushima Medical University School of Medicine, Fukushima City, Fukushima, Japan.
• Medicine (Baltimore). 2024 Apr 12; 103 (15): e37852e37852.

RationaleSerotonin syndrome is a potentially life-threatening condition resulting from the use of antidepressants, their interactions with other serotonergic medications, or poisoning. It presents with a triad of psychiatric, dysautonomic, and neurological symptoms and is sometimes fatal. While cyproheptadine is a specific treatment option, the optimal duration of its administration remains unclear. The purpose of this report is to quantitatively assess the endpoints of serotonin syndrome treatment. Based on the hypothesis that neurological pupil index (NPi) on a digital pupil recorder would correlate with the severity of the serotonin syndrome, we administered cyproheptadine using NPi as an indicator.Patient ConcernsA patient with a history of depression was brought to our hospital after he overdosed on 251 tablets of serotonin and noradrenaline reuptake inhibitors.DiagnosesOn day 3, the patient was diagnosed with serotonin syndrome.InterventionsCyproheptadine syrup was administered at 4 mg every 4 hours. The NPi of the automated pupillometer was simultaneously measured. On day 5, the NPi exceeded 3.0 cyproheptadine was discontinued.OutcomesThe patient was discharged on day 7.LessonsThe lack of considerable improvement during the treatment period suggests that the patient may have improved on his own. In this case, the relationship between NPi and the severity of serotonin syndrome could not be determined.Copyright © 2024 the Author(s). Published by Wolters Kluwer Health, Inc.

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