Abstract:
BACKGROUND:Diphenhydramine (DPHM) overdose is a frequent cause of acute poisoning. Although its clinical features are well known, information about the dose-dependent toxicity of DPHM is still scarce. The objective of this study was to investigate the dose-dependent toxicity of DPHM in patients with acute DPHM poisoning. METHODS:We have analyzed retrospectively all well-documented cases with DPHM monointoxications reported by physicians to the Swiss Toxicological Information Centre (STIC) between January 1984 and April 1996. In addition, a prospective study focusing on ingested DPHM doses and severity of symptoms was performed between May 1996 and December 1998. RESULTS:The retrospective and prospective studies included 232 and 50 patients with DPHM monointoxications, respectively. In both studies, mild symptoms (somnolence, anticholinergic signs, tachycardia, nausea/vomiting) occurred in 55-64%, moderate symptoms (isolated and spontaneously resolving agitation, confusion, hallucinations and ECG disturbances) in 22-27% and severe symptoms (delirium/psychosis, seizures, coma) in 14-18% of patients. Moderate symptoms occurred above ingested doses of 0.3 g DPHM. For severe symptoms the critical dose limit was 1.0 g DPHM. Although the frequency of delirium/psychosis remained constant or even decreased, coma and seizures were significantly (p<0.05) more frequent in the >1.5-g compared with the 1.0- to 1.5-g-dose group. CONCLUSIONS:These data demonstrate a clear dose-dependent acute toxicity of DPHM. They indicate that only patients with DPHM ingestions above 1.0 g are at risk for the development of severe symptoms and, therefore, should be hospitalized. Thus, the results contribute to the data basis required for a cost effective management of patients with DPHM overdose.
journal_name
Hum Exp Toxicoljournal_title
Human & experimental toxicologyauthors
Radovanovic D,Meier PJ,Guirguis M,Lorent JP,Kupferschmidt Hdoi
10.1191/096032700671040438subject
Has Abstractpub_date
2000-09-01 00:00:00pages
489-95issue
9eissn
0960-3271issn
1477-0903journal_volume
19pub_type
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