Cipro-Denk 500 is an antibiotic belonging to the fluoroquinolone group. The active ingredient is ciprofloxacin which is used in the treatment of bacterial infections. It is used in to treat the following bacterial infections: -Respiratory tract infections. -Long lasting or recurring forms of ear or sinus inflammation. -Urinary tract infections. -Infections of male and female genitalia. -Infections the gastrointestinal tract and infections of the abdominal cavity. -Treatment after inhalation of anthrax pathogens.