People with a sulfa allergy typically need to avoid sulfonamide antibiotics (antibiotics containing sulfa), including:
Septra and Bactrim (sulfamethoxazole-trimethoprim)
Pediazole (erythromycin-sulfisoxazole)
Whether other nonantibiotic sulfa-containing drugs need to be avoided with sulfa allergy is unclear and considered on a case-by-case basis.