Moxifloxacin is an antibiotic in the fluoroquinolone class of drugs. It is used to treat a variety of bacterial infections such as pneumonia, bronchitis, sinusitis, skin infections, and intra-abdominal infections. It works by stopping the growth of bacteria. Moxifloxacin should be used only to treat bacterial infections and should not be used to treat viral infections such as the common cold or flu. It is available as an oral tablet and an injectable solution. Like all antibiotics, moxifloxacin should be used only when prescribed by a healthcare provider and for the full course of treatment to ensure that the infection is completely treated.