Septazol is a broad spectrum antibiotic, used to treat infections caused by some types of bacteria, such as: Sore throat and tonsils caused by bacteria. Sinusitis. severe pneumonia; Shigella disease. Infections, stomach disorders. cases of travelers' diarrhea. Urinary tract infections. Infection with nemocystis carinae nemonia. Inflammation of the middle ear. Boils, abscesses, wound infections and animal bites. Dental infections and abscesses. Meningoencephalitis.