Moxifloxacin-d 3 (hydrochloride) is the deuterium labeled Moxifloxacin hydrochloride. Moxifloxacin hydrochloride is an orally active 8-methoxyquinolone antimicrobial for use in the treatment of acute bacterial sinusitis, acute bacterial exacerbations of chronic bronchitis, and community-acquired pneumonia.