Noroxin, first approved by the FDA in 1986, is an atibiotic used to treat urinary tract infections, cystitis, prostatitis, and some sexually transmitted diseases, among other infections. Although noroxin proves effective at killing certain types of bacteria, it also has an adverse effect on other body tissues, such as tendons. Serious tendon injuries, such as ruptured or torn tendons and tendonitis, have been associated with the use of noroxin. Several lawsuits have been filed throughout the United States against the manufacturers of noroxin and other fluoroquinolone antibiotics.