title: Two cases of cross-sensitivity in subjects allergic to paraphenylenediamine following ingestion of Polaronil.
abstract: We report the cases of 2 women presenting allergy to paraphenylenediamine (PPD). Both patients had a history of eczema that worsened following the ingestion of the antihistamine Polaronil (dexamethasone/dexchlorpheniramine). This clinical presentation could be explained by cross-sensitivity to sulfanilic acid (4-aminobenzene sulfonic acid), a metabolite of sunset yellow (FD&C No. 6). Sunset yellow is an azo dye present in this tablet. Indeed, PPD-allergic subjects may suffer from cross-sensitivity to related compounds, especially to those that can be ingested such as azo dyes. Such compounds are used in some instances by the food and pharmaceutical industries, but their presence is often undisclosed.
authors.affiliation: Department of Dermatology, Brugmann University Hospital, Free University of Brussels, Belgium. jeannine_borgers@stpierre-bru.be
authors.forename: C
authors.initials: C
authors.lastname: Sornin de Leysat
authors.forename: M
authors.initials: M
authors.lastname: Boone
authors.forename: A
authors.initials: A
authors.lastname: Blondeel
authors.forename: M
authors.initials: M
authors.lastname: Song
mesh_terms: D000328:Adult; D000893:Anti-Inflammatory Agents / Q000008:administration & dosage / Q000009:adverse effects; D002744:Chlorpheniramine / Q000008:administration & dosage / Q000009:adverse effects; D004396:Coloring Agents / Q000009:adverse effects*; D003429:Cross Reactions; D017449:Dermatitis, Allergic Contact / Q000209:etiology*; D003907:Dexamethasone / Q000008:administration & dosage / Q000009:adverse effects; D004347:Drug Interactions; D005260:Female; D006634:Histamine H1 Antagonists / Q000008:administration & dosage / Q000009:adverse effects; D006801:Humans; D008875:Middle Aged; D010655:Phenylenediamines / Q000009:adverse effects*
chemical_list: D000893:Anti-Inflammatory Agents; D004396:Coloring Agents; D006634:Histamine H1 Antagonists; D010655:Phenylenediamines; C018904:dexchlorpheniramine; D002744:Chlorpheniramine; D003907:Dexamethasone; C029728:4-phenylenediamine