Onazit Syrup is used to treat severe cases of thickened mucus caused by bacterial infections This medicine helps by killing the bacteria Onazit is also used to treat severe cases of nasal congestion caused by sinusitis to treat certain cases of pneumonia to treat inflammation of the throat caused by bacterial infections to treat certain bacterial skin infections to treat inflammation of the urethra caused by bacterial infections to treat inflammation of the cervix to treat certain genital diseases in men and to treat middle ear infections in children