I WAS prescribed 500 milligrams of Levaquin for 21 days. After 14 days on the medication I could barely walk. My achilles tendons felt like someone had hit me with a baseball bAT. That was in January. It is now August and I still have pain. My thighs hurt and I can barely lift my legs to walk up stairs. My knees ache severely, but it is mostly the weakness that is bothering me. I always had strong legs. Now I find it difficult to get up from a sitting position. I can't imagine what it will be like in a few more years. I am under a new doctor's care and am trying to weed out any other causes. I plan to sue if I do not regain the strength in my legs.