Having a "sulfa" allergy is quite common... What is uncommon is understanding that being "sulfa" allergic does not necessarily mean that one is also allergic to sulfates, sulfur, and sulfites. Also, when a patient states that have a sulfa allergy, they typically mean they have a "sulfonamide" allergy. Why is this understanding of significance? It's because there is confusion whether a patient with a sulfa allergy can take sulfate containing medications safe…