Draxxin Inj 20 Ml A180 is a sterile solution containing danofloxacin mesylate, a synthetic fluoroquinolone antimicrobial agent. Danofloxacin mesylate is the non-proprietary designation for (1S)-1cyclopropyl-6-fluoro-1, 4-dihydro-7- (5-methyl-2, 5-diazabicyclo [2.2.1]hept-2-yl)-4-oxo-3-quinolone carboxylic acid monomethanesulfonate. The empirical formula is C 19 H 20 FN 3 O 3 • CH 3 SO 3 H & the molecular weight is 453.49.