It is used to treat certain bacterial infections in many different parts of the body. It may also be used for other problems as determined by your doctor. Ofloxacin may mask or delay the symptoms of syphilis. It is not effective against syphilis infections. Ofloxacin belongs to the class of drugs known as fluoroquinolone antibiotics. It works by killing bacteria or preventing their growth. However, this medicine will not work for colds, flu, or other virus infections.