Levofloxacin belongs to the class of medicines known as quinolone antibiotics. It works by killing bacteria or preventing their growth. Levofloxacin is used to treat a number of bacterial infections including acute bacterial sinusitis, pneumonia, H. pylori (in combination with other medications), urinary tract infections, chronic prostatitis, and some types of gastroenteritis. Along with other antibiotics it may be used to treat tuberculosis, meningitis, or pelvic inflammatory disease. Use is generally recommended only when other options are not available. Ornidazole belongs to a class of antibacterial medications called 'nitroimidazoles' primarily used to treat infections caused by protozoans & bacteria. It is used to treat amoebiasis, chlamydiosis, giardia infection, trichomonas infection, vaginal, urinary tract, intestinal and post-operative infections.