Ciloxan is a prescription medication, specifically, a quinolone antibiotic. An antibiotic is prescribed for the treatment of diseases caused by bacteria. Ciloxan is used to treat various infections. It works by stopping the production of essential proteins in bacteria which leads to their eradication. This particular medication is popular because it can treat diseases that are caused by bacteria resistant to other forms of antibiotics. It comes in various forms, including eye drops and eye ointment.