Used to treat a variety of bacterial infections, including respiratory tract infections, urinary tract infections, skin infections, and prostatitis. Effective against both gram-positive and gram-negative bacteria. Commonly prescribed for pneumonia, bronchitis, and sinusitis. Also used in the treatment of certain types of infectious diarrhea and exposure to anthrax. Available in oral, intravenous, and ophthalmic forms, allowing flexible administration depending on infection severity.