I just started Proscar Thursday. I cut the 5mg pill in about 10 pieces so I am taking .5mg each day. Today when I tried to have sex it took me a while to orgasm. This happened yesterday to. I can still get it up and my gf seems to like me going longer, but I just do not want to damage anything. Is this common? Am I damaging something? It is a low dose. Its not bad I can still go a few times a day, and the orgasm is still enjoyable the thing that worries me is I am only a few days in.