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Penicillin (PCN or pen) is a group of antibiotics which include penicillin G (intravenous use), penicillin V (oral use), procaine penicillin, and benzathine penicillin (intramuscular use). They are derived from Penicillium fungi.
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.