Ofloxacin is a fluoroquinolone (flor-o-KWIN-o-lone) antibiotic that fights bacteria in the body. Ofloxacin is used to treat bacterial infections of the skin, lungs, prostate, or urinary tract (bladder and kidneys). Ofloxacin is also used to treat pelvic inflammatory disease and Chlamydia and/or gonorrhea.