http://www.medications.com/effect/view/679 I started taking Levaquin 500mg on 3/14/03 for a sinus infection. it is now 3/20/03 I have severe pain over my entire body . It started on 3/19 with pain in my arms and my forearms. My hands are involved and my elbows ,sholder,back ,neck, hips , legs,knees