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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.
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.