I had the unfortunate experience of taking both avalox and Levaquin to treat a case of chronic sinusitis. I received Levaquin for 10 days at 500 mg / per day. After four days I began experiencing extreme pain in my knees, soles of my feet, and hip joints. The pain became so severe I could barely get out of bed in the morning. I contacted my doctor who advised me to stop taking the drug immediately and prescribed another drug in a different class. It has been almost a month since stopping Levaquin and I continue to experience pain in my knees and soles of my feet. This website was a Godsend. I suspected my cotinued pain was caused by this drug but couldn't be sure. Thanks to you all for sharing the side effects you've suffered as well. This is definitely a case in which the treatment can be much worse than the illness.