For the treatment of the following infections caused by susceptible microorganisms: Lower respiratory tract infections, including pneumonia (moderate to severe) and bronchitis; Uncomplicated and complicated urinary tract infections (UTIs), including pyelonephritis; Skin and skin structure infections; Complicated intra-abdominal infections; including peritonitis and biliary tract infections; Empiric therapy (or febrile neutropenic patients; Septicemia.