Antibiotics and Other Sulfonamides to Avoid If You Have a Sulfa Allergy Sulfa drugs are synthetic (man-made) medications made from sulfanilamide that contain antibacterial properties. Sulfa drugs ...

True sulfite allergies can be treated with over-the-counter antihistamines or epinephrine for severe cases. The avoidance of sulfite-containing foods and drugs is also essential. Sulfa allergies ...