I was prescribed Cyprostat (Cyproterone acetate) by my doctor a couple of years ago and was on the drug for about 2 years.
For a crossdresser, it has some interesting effects.
It is prescribed for people with prostate cancer and can be used for chemical castration. It blocks the prostate from producing testosterone.
Before I started, I had quite thick chest hair and facial hair.
After being on the drug for a while, I found I lost almost all my chest hair, my facial hair was much less (shaving maybe once a week), the hair on my head was much nicer and my complexion was much nicer
AND I started to develop quite nice breasts.
The down side is you loose your libido, but I was single at the time, so did not worry me and I did not get aroused when dressed, which I was happy with.
I dont think I would recommend it, but it was interesting to experience what a teen girl feels like to start growing real breasts. At one point, I was even worried about a lump and had a mammogram.