Levaquin is used to treat infections of the lower respiratory tract, urinary tract, kidneys, skin, soft tissues, chronic bronchitis, acute sinusitis, chronic bacterial prostatitis and tuberculosis. The drug is a fluoroquinolone, a broad-spectrum antimicrobial bactericide. It blocks DNA gyrase and topoisomerase IV, disrupts supercoiling and cross-linking of DNA gaps, suppresses DNA synthesis, causes profound morphological changes in the cytoplasm, cell wall and bacterial membranes.