I also have had severe side effect from Levaquin. I took 3 pills(1 a day for 3 days). I was given a 10 day supply. By the second day I had a sore shoulder. The next day I could not even raise my right arm. I've been on pain pills, muscle relaxers, etc. No medicine has helped. I was refered to an orthopedic doc and I have had 2 inhections in my right shoulder and just started physical therapyfor 3 days a week for 4 weeks. That has still not correct the promlem, Oh! The problem is a torn rotator cuff.