Bacitracin Alias: CAS NO.: 1405-87-4 M.F.: C66H103N17O16S M.W.: 1422.69 Assay: 99% Appearance: Package:25kg/fibre drum Specification: BP2007/USP31 Usage: As a toxic and difficult-to-use antibiotic, bacitracin does not work well orally. However, it is very effective topically. Its action is on gram-positive cell walls.