Last July Tall Allen listed a number of alternative treatments for your dad. Some of them are quite expensive and may not be available in Morocco but others are fairly inexpensive and are available most places.
The Tall One said...
All I can say is that castrate-resistance does set in eventually, sometimes sooner, sometimes later. There are a whole new set of hormonal drugs that may continue to work even after castrate resistance occurs. They include Zytiga, Xtandi, Ketoconazole and Estrogen.
Now may be a good time to begin chemo with docetaxel. There is an immunotherapy called Provenge - I don't know if it's available in Morocco.
Bone density erodes after castration, so it is necessary that he take Xgeva, Zometa, or other bisphosphonate. That may also prevent spinal compression and fractures.
It's harder to definitively diagnose bone mets after castrate resistance. Perhaps he can get a NaF18 PET/CT scan after his PSA gets a bit higher. If that indicates the spot on his spine is a met and there is only the one or very few, he can have it zapped with SBRT (3-5 treatments). If it discovers multiple mets (more than 5), he can have a single dose palliative treatment to them, or a new drug called Xofigo, if it's available there.
I seem to recall that Ketoconazole and Estrogen are relatively cheap. They might be things he could talk to his doctor about