I was on levitwin, which is the brand name. I started having pain in my ankles. Then, the next time I was on it my knees. Every time I was on it, the pain moved into more joints to the point where I ended up at the hospital in such severe pain. I told my doctor but they ignored it. They continued to order levaquin every time I had lung infection. The main side effect is rapturing your achilles tendon. But it affected me in all my joints. Needless to say, it's on my list of allergies