I read on avodart's web site that it stays in your system up to 240hrs compared to propecia is only 24hrs, plus I want to minimize any side affects. I was on propecia for a long time and quit a few years ago because my libido was zero. I also just bought aromatase inhibitor off bodybuilding.com it suppose to keep testosterone from converting into estrogen, I think that libido loss is also caused from increased estrogen in the body from propecia or avodart. Will see I havent taking it yet its coming in the mail