If I start propecia and sexual sides appear, will I notice them right away? I'm getting the sense that the people who are affected by the sexual sides (libido loss, erection issues) noticed it right away, at least after the first week. I've noticed some people here actually reported increased libido in the first initial week, but then have it drop way low. Is there a consensus on this? Can you anyone give some input as to what they experienced as far as sides???