I am currently on testosterone replacement therapy, doctor prescribed from my endo at 100mg every week. I have been noticing latly that my hair is thinning out a lot so I went to a dermatologists to talk to her about it. I asked about Finasteride(Propecia), and she called it a "anti testosterone". That was the first I have heard of that. So I wanted to know if taking Finasteride would require an increase in the amount of testosterone I use or if what she said is BS.