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doi: 10.1159/000118919

and Honorary Associate Professor Paul Jarrett, Dermatologist, Middlemore Hospital and Department of Medicine, The University of Auckland, Auckland, New Zealand (2024) Previous contributors: Dr Marie Hartley, Staff Writer (2010) Reviewing dermatologist: Dr Ian Coulson Edited by the DermNet content department Introduction Sulfonamide antibiotics Sulfa allergy Non-antibiotic sulfonamides Cross-reactivity Other sulfur drugs Sulfa is a broad term used to describe medications that contain a sulfonamide (sulphonamide) functional group within their molecular structure