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Bactrim is a sulfa-based antibiotic and is not a penicillin-based medicine, according to RxList. However, a patient should discuss all allergies with a doctor to determine what drugs can and cannot be taken. Continue Reading.
Get help from a doctor now âº. Maybe: Penicillins (like amoxil) & cephalosporins (like keflex) are both beta-lactam antibiotics named because of their ringed chemical structure. Allergy to penicillins is sometimes directed against this ring, and an allergic reaction may also occur if a similar antibiotic is taken.