I have been on 2mg Caraxasin (Doxadosin) for a few years, together with 10mg Amlodepine and Finasteride 5mg. No noticeable side effects after this long, BP is averaging 125/75, and I am peeing as normal even though I know my prostate is enlarged. Libido is a bit reduced.
I do realise that I could be overdoing it, but it seems to be working for me.