I started taking Levaquin last Monday, today is Saturday the 17th of May. I have a chronic sinus infection which i was given Augmentin that did not work. The Augmentin was taken for 10 days. Then I was told to wait 5 or 6 days to see if the infection would clear up. No it did not. So my doctor gave me 10 days of 750mg of Levaquin. I started taking Levaquin last Monday, today is Saturday the 17th of May. I decided to get back to walking for exercise to loose a little extra weight gained this past winter. I walked about 1 mile. I am used to walking and that is nothing. I usually try to walk 5 to 6 miles each evening. Today, I can hardly move. My hips are sour and my shoulders are killing me. I thought I must be really out of shape, but why are my arms and shoulder hurting. After reading the postings here, I am sure it is the Levaquin. I was fine Monday as far as muscle aches and pains just the sinus infection. Now I can hardly move. I will call my doctor first thing Monday morning. Thanks to you all for your postings and good luck.