Levaquin (Levofloxaxin) is an antibiotic kills certain bacteria or stops their growth. It is used to treat urinary tract, prostate, skin, sinus and lung infections, as well as other infections. Calcium, iron, and zinc preparations can also stop levofloxacin from working properly. Take calcium tablets, iron tablets, zinc tablets, or vitamins that contain calcium, iron, or zinc at least 2 hours before or two hours after levofloxacin. Levaquin can change level of blood sugare. Levaquin can cause  overuse injuries to the tendons and ligaments as well as acute injuries from accidents.