Topic overview

Start with the big picture

The lesson organizes these agents around how they work and where they are used. Metronidazole forms reactive metabolites that damage DNA in anaerobes and protozoa, while urinary agents such as nitrofurantoin, fosfomycin, and methenamine have distinct mechanisms and limitations. Polymyxins disrupt the outer membrane of gram-negative bacteria and are described in the context of resistant infections; topical bacitracin and mupirocin have more limited applications. Daptomycin and linezolid target gram-positive bacteria, with important differences in use and adverse effects. The broader topic also includes fidaxomicin, rifaximin, chloramphenicol, and spectinomycin. Across the agents, the lesson highlights mechanisms, clinical applications, and safety points such as toxicity, contraindications, and monitoring.