10. Drug allergy Journal of Allergy and Clinical Immunology Sulfa Allergy: What It Is and How to Avoid It This is what happens when you are allergic to Sulfa : r WTF Datis If you have a sulfur sensitivity, glutathione can be problematic. Glutathione is primarily made up of sulfur, which can cause issues for those with a sulfur sensitivity. While Glutathione is Can a patient with a sulfonamide allergy safely receive metronidazole?