Do I need to get seperate antiandrogen meds?

I'm planning on getting HRT in the coming weeks, at least just to try for a month or so to see its effects as I can't get blood tests currently. I'm going to be buying Climen tablets, which are pretty cheap, but in the guide I'm following it tells me to get Androcur tablets as well which are insanely expensive for me.

Is it absolutely required that I buy them, or can the small amount of cypro in Climen tablets be sort of sufficient?