This document discusses different classes of beta-lactam antibiotics including penicillins, cephalosporins, monobactams, and carbapenems. It describes the four generations of cephalosporins and provides examples of drugs within each generation. It highlights characteristics such as antimicrobial spectrum, stability to beta-lactamases, and clinical uses for each generation of cephalosporins. It also summarizes the characteristics, mechanisms, and uses of vancomycin and beta-lactamase inhibitor combinations.