{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,8]],"date-time":"2026-08-08T14:43:24Z","timestamp":1786200204872,"version":"build-2736575974"},"reference-count":19,"publisher":"Oxford University Press (OUP)","issue":"7","license":[{"start":{"date-parts":[[2026,7,1]],"date-time":"2026-07-01T00:00:00Z","timestamp":1782864000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/pages\/standard-publication-reuse-rights"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,7,23]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>We report a case of a previously healthy 3-year-old girl who developed acute altered consciousness, agitation, and visual hallucinations consistent with an anticholinergic toxidrome. Initial examinations were unremarkable, and urine immunoassay screening (SIGNIFY\u2122 ER) was negative. Serum analysis by liquid chromatography\u2013quadrupole time-of-flight mass spectrometry identified chlorpheniramine and scopolamine, while excluding other agents. Concentrations were 370\u2009ng\/mL for chlorpheniramine and 1\u2009ng\/mL for scopolamine, both near reported toxic ranges. An empty blister pack of 22 pediatric motion sickness tablets was found at the patient\u2019s home, confirming accidental overdose of an over-the-counter (OTC) anti-motion sickness medication. This case demonstrates the diagnostic utility of high-resolution mass spectrometry in pediatric poisoning, particularly for drugs not detected by routine screening. It represents a rare report documenting quantitative confirmation of both chlorpheniramine and scopolamine in a child, with correlation between serum concentrations and clinical presentation. Scopolamine is highly toxic even at low concentrations, and pediatric cases with measured blood levels are exceedingly rare. Our findings highlight the need to consider additive or synergistic toxicity in OTC formulations containing multiple anticholinergic agents and emphasize the importance of caregiver education regarding the potential risks of OTC medications often perceived as safe.<\/jats:p>","DOI":"10.1093\/jat\/bkag066","type":"journal-article","created":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T11:49:30Z","timestamp":1784116170000},"source":"Crossref","is-referenced-by-count":0,"title":["Anticholinergic toxidrome in a toddler with unwitnessed ingestion: diagnostic clues pointing to over-the-counter medication overdose"],"prefix":"10.1093","volume":"50","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0977-5043","authenticated-orcid":false,"given":"Sayaka","family":"Nagasawa","sequence":"first","affiliation":[{"name":"Laboratory of Forensic Toxicology, Graduate School of Pharmaceutical Sciences, Chiba University , Chiba City, Chiba, 260-8672,","place":["Japan"]},{"name":"Department of Legal Medicine, Graduate School of Medicine, Chiba University , Chiba City, Chiba, 260-8675,","place":["Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Go","family":"Inokuchi","sequence":"additional","affiliation":[{"name":"Department of Legal Medicine, Graduate School of Medicine, Chiba University , Chiba City, Chiba, 260-8675,","place":["Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haruna","family":"Tokitomo","sequence":"additional","affiliation":[{"name":"Department of Pediatrics, Children\u2019s Medical Center, Matsudo City General Hospital , Matsudo City, Chiba, 270-2296,","place":["Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hiroshi","family":"Okada","sequence":"additional","affiliation":[{"name":"Department of Pediatrics, Children\u2019s Medical Center, Matsudo City General Hospital , Matsudo City, Chiba, 270-2296,","place":["Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hirotaro","family":"Iwase","sequence":"additional","affiliation":[{"name":"Department of Legal Medicine, Graduate School of Medicine, Chiba University , Chiba City, Chiba, 260-8675,","place":["Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2026,7,15]]},"reference":[{"key":"2026080810070687400_bkag066-B1","doi-asserted-by":"publisher","first-page":"e2020049536","DOI":"10.1542\/peds.2020-049536","article-title":"Pediatric fatalities associated with over-the-counter cough and cold medications","volume":"148","author":"Halmo","year":"2021","journal-title":"Pediatrics"},{"key":"2026080810070687400_bkag066-B2","doi-asserted-by":"publisher","first-page":"2203","DOI":"10.1056\/NEJMra033121","article-title":"Advances in H1-antihistamines","volume":"351","author":"Simons","year":"2004","journal-title":"N Engl J 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