Used topically as an antibiotic to prevent growth of bacteria in minor cuts, scrapes, or burns. Commonly found in over-the-counter ointments and eye drops due to its effectiveness against Gram-positive bacteria. Often combined with other antibiotics like neomycin and polymyxin to broaden antimicrobial coverage. Primarily acts by interfering with bacterial cell wall synthesis, making it effective in localized infections. Not used systemically due to potential kidney toxicity. Also used in veterinary medicine and in cell culture labs to prevent bacterial contamination.