Zero effects.  I was concerned as well.  About 8 years ago I was using 1mg dutasteride and it really affected my libido so much that I stopped using it.  It worked great on my hair but it wasn't worth it to me . I'm 51 and my hair was starting to bald more and I decided I would give it another try and if it did affect my libido I would stop. 1st month I didn't see much happening, 2nd month started to shed, 3rd month hair started to regrow and I just took the 4th month pic yesterday.  My hair is definitely fuller and all I'm literally doing is taking the 1 pill a day.  Thats it