yes, finasteride is effective against DHT, which is one of the bi-products of test. test will break down into either estrogen or DHT. test is the only steroid that finasteride with effectively block. be aware of this, as you possibly venture into other drugs down the road. some steroids, such as deca or tren can actually become worse on the hairline if you use them with finasteride. so you may want to avoid these 19-nor compounds. also be aware that test breaks down differently for everyone. some release more DHT while others break more down into estrogen. if you are blocking it from breaking down in one of these two ways, there is a chance that the other will be increased. so in this case, there may be a chace that you will convert to more estrogen while using a DHT blocker. make sure you are also using a low dose of an AI, such as aromasin or adex. both are effective