Marbofloxacin is a carboxylic acid derivative third generation fluoroquinolone antibiotic. Marbofloxacin is a synthetic, broad spectrum bactericidal agent. The bactericidal activity of marbofloxacin is concentration dependent, with susceptible bacteria cell death occurring within 20–30 minutes of exposure. Like other fluoroquinolones, marbofloxacin has demonstrated a significant post-ntibiotic effect for both gram–and + bacteria and is active in both stationary and growth phases of bacterial replication.