benign prostatic hyperplasia
"I am 50yo and was on 1-4mg Hytrin for 7 months for urinary retention and disliked it. It barely made a dent in my symptoms, and made me tired and fatigued - muscles always felt weak, was frequently irritable and interfered with my sleep. Took forever to build up to 4mg. However, I still had a libido with few sexual side effect, which was a very nice surprise. Recommend trying it to see if it works even though it's one of the older alpha-blockers."