You don't want finasteride.
I was a solid lifter in my late teens before my doctor put me on finasteride for premature hair loss, I went on it not knowing the side effects, became very lethargic, suffered from ED, lost my sex drive completely and put on a ton of weight. I went from 185lbs to 223lbs and ended up at 28% bodyfat.
Finasteride will block DHT but estrogen will rise. Be careful if you end up going with it, I'd send you the rest of mine if I hadn't tossed it.