I am a personal trainer and athelete.... I visited the doctor for the treatment of swollen lymp noids..I was prescribed a 10 day supply of 500mg of Levaquin..after taking this med for 3 days the tendon in my left leg and all throughout the joints had such severe pain I had never felt before...I could hardly walk without holding on to something for support..the pain was so excruciating I got up this morning(3a.m.) to research this drug and low and behold I came upon this site..amazing!! IF YOU EXERCISE REGULARLY,BE AWARE OF THIS DRUG!!! it will definitly cause joint problems..(P.S.) MY LYMP NOIDS FEEL BETTER THOUGH!!!