XXY und was auch immer fällt nicht unter F64.
Das ist eigentlich relativ orthogonal: Eine Freundin von mir ist trans und hat gleichzeitig Klinefelder, was zwar gewisse Auswirkungen auf Dinge wie Anatomie hat aber prinzipiell weder an der Geschlechtsdysphorie noch an der Notwendigkeit hormoneller und gegebenenfalls chirurgischer Eingriffe ändert.
From what I found that is a brand name for Bicalutamide (“Bica”). AFAIK it is a competitive antagonist for the androgen-receptor, which means that it will bind to all the places that Testosteron would bind to without activating the “sensor”, thereby preventing Testosteron from doing the same with effect. The consequence of this is that your T will actually increase, but still not pose any problem if your dose is high enough. The difficulty is then, that you cannot really measure whether your T is properly blocked, because the blood-levels will still be high. Endocrinologists hate it as a consequence, but if you are fine with that, that’s okay.
Other than that Bica seems to be popular with those who take it, but you will require a liver-function test a while in since it can cause some very severe liver-issues with some people (AFAIR you either are susceptible or you are not, so if it’s fine a few month in it should stay fine, but I might be wrong on that; DEFINITELY check the details on that one).