Don't know about that mate...
https://en.wikipedia.org/wiki/Cyproterone_acetate
Cyproterone acetate, sold alone under the brand name Androcur or with ethinylestradiol under the brand names Diane or Diane-35 among others, is an antiandrogen and progestin medication which is used in the treatment of androgen-dependent conditions like acne, excessive hair growth, early puberty, and prostate cancer, as a component of feminizing hormone therapy for transgender women, and in birth control pills.
Common side effects of high-dose CPA in men include gynecomastia (breast development) and feminization. In both men and women, possible side effects of CPA include low sex hormone levels, reversible infertility, sexual dysfunction, fatigue, depression, weight gain, and elevated liver enzymes.
Half of those side effects don’t even make sense, CPA doesn’t lead to gynecomastia or feminisation since it lowers both testosterone and estrogen. Otherwise, those other side effects are typical to androgen deprivation therapy; he could combine bicalutamide and CPA avoid almost all of those.