Antibiotics and Other Sulfonamides to Avoid If You Have a Sulfa Allergy Medically reviewed by Jurairat J. Molina, MD Sulfa drugs are synthetic (man-made) medications made from sulfanilamide that ...

The effectiveness of penicillin and other antibiotics in preventing certain bacterial infections has decreased but not eliminated the use of sulfonamides for chemoprophylaxis. In some situations these ...