Looking it up the main active ingredient seems to be just a 5 alpha reductase inhibitor (Arecanut), which you can get your doctor to give you a prescription for a pharmaceutical grade version of a 5 alpha reductase inhibitor (dutasteride for example) if you think that is the way to go. And for urinary symptoms d-mannose is a good option.

Here is an alternative to basic 5 alpha reductase inhibitors, though I would approach this one more cautiously:
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Diindolylmethane (DIM) or DIM sources/
A "good" DHT blocker that possibly leaves Total Testosterone alone - anti-excessive DHT
Examples:
(least pure) Broccoli powder (not seeds or sprouts) or broccoli extract
(mid-level form) Indole 3-carbinol
(purest form) DIM
DIM supposedly reduces DHT without reducing Free and total testosterone. This differs from 5-alpha reductase inhibitors which in some people stops working correctly (they may cause possible gonad damage, and other medical complications) and thus contribute to sexual dysfunction. DIM therefore is likely a good alternative for BPH and DIM is good where the DHT is in excess. It is possible it may not always work perfectly.
Indole 3-carbinol becomes DIM when ingested. It is found in Broccoli and cruciferous vegetables.
High dose DIM test on precursor to PCa
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4818865/
DIM basic info articles
The Benefits of DIM
https://fortwaynephysicalmedicine.com/blog/the-benefits-of-dim
What Are DIM Supplements? Benefits and More
https://www.healthline.com/nutrition/dim-supplement
Take Care of Your Prostate Naturally
http://doctortrethart.com/show_art.php?isbn=16022011