How long until the affects of cipro on your tendons goes away?

I have taken 1000 mg of cipro, that's 2 doses of 500 mg. I can hardly walk from the pain in my right leg. I am afraid that the tendon is going to snap. How does cipro damage tendons, and is there any way for the body to heal to stop further damage and stop the pain? Is there still cipro in my body? I took it a week ago.