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 ...

The avoidance of sulfite-containing foods and drugs is also essential. Sulfa allergies and sulfite allergies are not the same. Sulfa allergies involve sulfonamides, also known as sulfa drugs ...