Baytril 100 is a sterile, ready-to-use injectable antimicrobial solution that contains enrofloxacin, a broad-spectrum fluoroquinolone antimicrobial agent. Each mL of Baytril 100 contains 100 mg of enrofloxacin. Baytril 100 is FDA approved for treatment of Bovine Respiratory Disease in cattle and Swine Respiratory Disease in pigs. FDA prohibits extra-label use in food animals. Baytril 100 is used extra-label in the treatment of susceptible infections in horses and other species. Made by Bayer.