Levaquin is a prescription antibiotic used for a number of different indications, such as the treatment of urinary tract, bladder, and kidney infections, anthrax inhalation, bronchitis, pneumonia, sinus infections, and Chlamidia, among others.In July 2008, the FDA required that Levaquin contain a black box warning on its packaging, advising consumers of the risk of serious side effects associated with taking the drug. Levaquin has been associated with a number of serious side effects, such as a dramatic decrease in white blood cells, arrhythmia, blood clotting disorders, seizures, liver damage, kidney damage, tendonitis, ruptured tendons, and a decreased level of blood platelets causing excessive bleeding.