Cipro(Ciprofloxacin)-Ciprofloxacin is an antibiotic used to treat certain infections caused by bacteria. Ciprofloxacin tablets and suspension (liquid) are used to treat pneumonia (lung infection); bronchitis (infection of the tubes that lead to the lungs); some types of gonorrhea (a sexually transmitted disease); diarrhea caused by bacteria; typhoid fever (a contagious illness common in developing countries); and bone, joint, skin, prostate (a male reproductive gland), sinus, and urinary tract (bladder) infections. Ciprofloxacin is also used to prevent and/or treat anthrax in people exposed to anthrax germs in the air. Ciprofloxacin is also used with another medication to treat certain infections of the internal organs. Ciprofloxacin extended release (long-acting) tablets are used to treat urinary tract and kidney infections. Ciprofloxacin is in a class of antibiotics called fluoroquinolones. It works by killing bacteria. Antibiotics will not work for colds, flu, or other viral infections.