My dad started xtandi and prednisone. His PSA was 13 since taking his meds and shots the PSA went down to a 4.0 Doctor office called and young lady told me to tell my dad to stop taking meds and to come see the doctor on June 12. I thought my dad would be taking the meds indefinately along with lupron and xgeva shots. I couldnt ask why we should stop the pills all she said were numbers were low. And come in and talk to the doctor in 2 weeks. Anyone know why he would stop the pills I thought they want the PSA at 0? And pills would be taken as long as it keeps the PSA very low?