Abstract
Astemizole is a widely prescribed nonsedating antihistamine that suppresses wheal and flare reactions from histamine prick testing. We report a two-year-old girl with a serum concentration-proven overdose of astemizole who nonetheless exhibited a significant wheal and flare reaction after histamine skin prick testing for at least 22 hours after the ingestion. These findings suggest that histamine skin prick testing should not be used as a screening test to evaluate whether an ingestion of astemizole has occurred.
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