I took 500 mg of Levaquin more than two years ago and am still have severe tendon problems. I was a runner and triathlete. Now my hips and elbows ache so bad that just daily routines are difficult. I have heard that Levaquin has a dispropriate effect on athletes. So if you are a runner or triathlete do not take this drug. YOU WILL NEVER BE THE SAME. The information provided by the manufacturers regarding the side effects is false. The incident of injury for certain groups is much much higher than they report.