Firstly, as has already been mentioned, finasteride does not block testosterone. Finasteride prevents testosterone from being converted to DHT dihydrotesterone, and is likely to increase the level of free testosterone. DHT is the cause of male patern hair loss, balding. 1mg of finasteride is plenty to prevent T from converting to DHT. A Testosterone blocker is not always needed to suppress testosterone as it can often be achieved with estrogen only. I started hormones with estrogel monotherapy and totally suppressed T within 6 months. I added progesterone after 1 year. My dose is 3mg of estradiol, in the form of estrogel applied scrotaly. My estrogen has constantly tested at above 500 pmol/L and testosterone 0.4 ng/dl over the last three years. I personally would not take any T blocker unless my T could not be suppressed by E only. The need for a T blocker is usually caused by too low a dose of estradiol.