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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.
There are four types of penicillins: 1  The natural penicillins are based on the original penicillin-G structure. 2  Penicillin-G types are effective against gram-positive strains of streptococci, staphylococci, and some gram-negative bacteria such as meningococcus.