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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.
Another name for this class is the beta-lactam antibiotics, referring to their structural formula. 1  The penicillin class contains five groups of antibiotics: aminopenicillins, antipseudomonal penicillins, beta-lactamase inhibitors, natural penicillins, and the penicillinase resistant penicillins. Common antibiotics in the penicillin class include: penicillin V potassium; amoxicillin; amoxicillin/clavulanate (Augmentin) View penicillin drugs. 2.