Therapy/Class: Antibiotic
Mechanism of Action:
Polymyxin B: A bactericidal cyclic lipopeptide that targets and disrupts the outer cell membrane of Gram-negative bacilli. It binds to lipopolysaccharides, severely altering membrane permeability and causing osmotic lysis.
Chloramphenicol: A highly lipophilic, bacteriostatic agent that diffuses rapidly across ocular tissues, binding reversibly to the 50S ribosomal subunit to interrupt peptidyl transferase activity and block bacterial protein synthesis.