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Print Print. Penicillin is a group of antibiotics that are commonly used to treat different types of gram positive and gram negative bacterial infections. In their structure, beta lactam ring is located due to this reason these drugs are also called as beta lactam antibiotics.
Penicillins What are Penicillins. Penicillins are a type of antibiotic derived from Penicillium fungi. Alexander Fleming discovered the first penicillin in 1928 (benzylpenicillin also called penicillin G). Since then, several other penicillins have been derived, and the original structure has been modified to create new penicillins with enhanced effectiveness against a broader range of bacteria.