I took proscar for a few yrs. (cut it in 4ths = 1.25mg) But, that shit fucked up my libido, mood, etc. I went to a well know hrt dr. and told him my symptoms. He replied by asking "How long have you been taking proscar/propecia?" Sure enough my labs showed my DHT was almost 0. DHT is not all bad it helps w/sex drive ect. Be carefull.