Sulfa allergy: A Mayo Clinic expert discusses which medications are likely to cause problems.
Someone who has a sulfa allergy can react to some medications that contain sulfa.
Antibiotics containing chemicals called sulfonamides can trigger a reaction if you have a sulfa allergy. These antibiotics include combination drugs:
Other types of sulfa medications may trigger a reaction in some people who have a sulfonamide antibiotic allergy:
Keep in mind that if you have a reaction to a sulfonamide antibiotic, you may still be able to take other sulfonamide medications without having a reaction.
An allergy to sulfonamide medications is different from having an adverse reaction to wine or food that contains sulfites. Having a reaction to sulfites in something you eat or drink doesn't mean you'll be allergic to sulfonamide medication.
If you have HIV/AIDS, you may have an increased sensitivity to sulfonamide medications. Always tell your doctor about your sensitivities to medication.
There are no diagnostic tests for sulfa allergy. However, sulfa desensitization might be an option, especially if medication containing sulfamethoxazole is needed.