That's the downside. We have to have our prostate shrunk and medication that does it can also affect our penis. Have you had much shrinkage? Shrinkage can happen for different reasons. Even getting older an cause it, smoking, taking various medications (not just avodart), gaining weight, etc. Do you find you also have erectile dysfunction? Avodart, unfortunately, is associated with these side effects. It's unclear though how long they will last. What does your doctor say? What prompted starting the med? Your psa looks pretty good.