My former doctor (a professor of medicine at a major university) suggested Saw Palmetto herb for prostate enlargement/slow flow of urine. It works great. I have had to increase the dosage over the 15-or-more years I have been on it. But if I forget to take it for two days, I'm back to the old slow trickle. Two days back on it, then I am OK.
My current doctor, also a Med prof at the same institution and a friend and colleague of the old doctor, does not believe in Saw Palmetto and also says I do not have BPE. But the results are clear to me.