If a man has been on a 5-alpha reductase inhibitor for urinary symptoms prior to prostate radiation therapy, is there value in continuing it after radiation therapy?  

5-alpha reductase inhibitors, e.g. dutasteride, are indicated for the treatment of symptoms related to BPH and an enlarged prostate and have some efficacy for this indication, especially when combined with alpha blockers. 5-alpha reductase reduces a double bond in testosterone to create a more poten...