NEW : Consumer group pleased with order but says FDA must do more . The FDA ordered its strongest warning to be put on certain antibiotics . Public Citizen , founded in 1971 by consumer activist Ralph Nader , said more than 400 cases of tendon rupture and more than 300 cases of tendonitis in patients using fluoroquinolones were reported between November 1997 and December 2007 . The `` black box '' label will alert patients of possible tendon problems . Relevant drugs include Noroxin , Cipro , Levaquin , Cipro and Floxin .
NEW : Consumer group pleased with order but says FDA must do more . The FDA ordered its strongest warning to be put on certain antibiotics . The `` black box '' label will alert patients of possible tendon problems . Relevant drugs include Noroxin , Cipro , Levaquin , Cipro and Floxin .