Bacitracin is a polypeptide antibiotic used for staphylococcal infections. Bacitracin functions as an inhibitor of cell wall biosynthesis through its binding to the undecaprenyl pyrophosphate. The combination of bacitracin with other antibiotics has been efficient to be used as a topical agent[1].
[1]. Si W, et al. Colistin Induces S. aureus Susceptibility to Bacitracin. Front Microbiol. 2018 Nov 20;9:2805.