INFUXACIN injection is used to treat certain infections caused by bacteria such as pneumonia; and infections of the skin, bone, joint, abdomen (stomach area), urinary tract, and prostate (male reproductive gland). INFUXACIN injection is also used to treat patients who have fever and are at high risk for infection because they have very few white blood cells. INFUXACIN injection is also used to prevent or treat plague (a serious infection that may be spread on purpose as part of a bioterror attack) and inhalation anthrax (a serious infection that may be spread by anthrax germs in the air on purpose as part of a bioterror attack) . INFUXACIN may also be used to treat bronchitis and sinus infections, but should not be used for these conditions if there are other treatment options available. INFUXACIN injection is in a class of antibiotics called fluoroquinolones. It works by killing bacteria that cause infections.