Can Firmagon And X Gevia Cause Inability To Walk?

my dad has prostate cancer 5 yrs. age. doctor did radiation. he was good for 4 and half year. but few month ago his psa start increasing. Doctor did his bone x rays and abdominal ultra sound. it was normal, bur when they did pet scan of bones and abdominal ct scan they found cancer in bones and 1 small tissue in liver. they give him 1 injection ( should give his every 6 months, it was to stop the cancer cell, but this did not work and his psa was increasing, now they give his fermagone every month and x gevia. but before these injections he was healthy and very normal but now he is not even able to walk.