Delayed-type drug eruption to phenazopyridine (pyridium) confirmed with patch testing

Winnie W Y Yeung; Christina S M Wong; Wai-Yan Leung; Philip H Li

doi:10.5415/apallergy.2022.12.e10

Delayed-type drug eruption to phenazopyridine (pyridium) confirmed with patch testing

Asia Pac Allergy. 2022 Jan 25;12(1):e10. doi: 10.5415/apallergy.2022.12.e10. eCollection 2022 Jan.

Authors

Winnie W Y Yeung¹, Christina S M Wong², Wai-Yan Leung¹, Philip H Li¹

Affiliations

¹ Division of Rheumatology & Clinical Immunology, Department of Medicine, Queen Mary Hospital, The University of Hong Kong, Hong Kong.
² Division of Dermatology, Department of Medicine, Queen Mary Hospital, The University of Hong Kong, Hong Kong.

Abstract

Delayed hypersensitivity reaction of penicillin is commonly seen, but never reported in pyridium. This case illustrates a patient with delayed hypersensitivity reaction after the use of augmentin and pyridium. Skin patch test, surprisingly, confirmed pyridium delayed hypersensitivity.

Keywords: Hypersensitivity; Penicillin; Phenazopyridine.

Publication types

Case Reports