You can def try and stack them. The yohimbine can bring your bp back up a bit while still blocking the receptors. In my case yohimbine boosted my libido but would give me tight sac and quickly fading erections because it raises norepinephrine (too much flight...).
Ultimate Adrenergic Control of Erections
That's a great thread with a lot of ideas for guys to try out. I went thru most of them over the years after reading it (tried all the alpha blockers). However I ended up simply keeping blood sugar/insulin very low, fasting daily and taking vasodilating compounds like berberine/metformin. I still use cialias daily at 5mg too for the NO boost (and l-cit).
Rone, first of all, thank you for posting that old thread, I thought it was gone forever!! I did learn a BUNCH from reading it, some of the stuff many of them were doing towards the end of that long thread I would NEVER do, but most of it was pretty thoughtful and helpful. The guy that founded that thread, " Tierry " seemed to take pretty big amounts of this or that, I've taken much less.
And yes, Yohimbine HCL from Amazon does raise my BP. The that effect does last for about 24 hours as well.
I didn't have any severe side effects from taking the alpha blocker alfusin from ReliableRX, it did add further to the nose stuffing effect, and heart rate picked up a little. No negative mental effects. The Flomax (tamsulosin) from ReliableRX worked at least as well (for date night purposes I mean), but I did experience lessened ejaculation on one tablet, and total retrograde ejaculation on two tablets. It wasn't a bad thing per say, just kinda strange. Not painful though.