No, there is Zoladex, Lupron and Prostap. When they fail, bicalutimide can be added which usually works for a while. When that fails, Abiraterone or enzalutimide are possibilities but not available in all countries. There is also Radium 223 for some men with bone spread and steroids are sometimes used.
Abiraterone costs about £2500 per month
Enzalutimide costs about £100 per day / £3000 per month
Radium 223 is usually given as 6 injections of one per month at £4000 per injection
Some of these have generic versions in India which are cheaper but dad is unlikely to need them until his current treatment fails.