Does anyone know of the long-term effects of Cipro on tendons? I took 500 mg of Cipro for 30 days in Feb. 1997. I later ruptured my left Achilles tendon in Sept. 1997 (while playing basketball for the first time in years) and my right Achilles in Oct. 1998 (again, while playing basketball after a year off from the previous tendon rupture). FYI, I have continued to jog (~100 times/year, after healing from surgery) without any problems. I would like to play tennis and other sport activities but am worried about sustaining another tendon injury. Has anyone else dared to test their tendon strength after bilateral tendon ruptures?