I took gabapentin 100mg/doxazosin 2mg for a week and didn't die. I didn't end up incontinent either. I also went 24/7 at the same time to really judge the effects, if any, for myself. Going in i'd rate my continence pretty high. I've done 24/7 before for a month at most, the main thing from that is that I'm pretty comfortable going in a diaper at home and some public places.
The main effect would have to be the distinct light headedness first few days, and trouble sleeping first few nights. Dont fuck with this if you have a history of blood pressure issues or do some strenuous activity I guess. It had me pretty lethargic at first but leveled out after that. Second would be it maybe made it somewhat easier to relax and pee often in small amounts, and more often feeling an urge to pee. This may have also just being 24/7 and peeing at the slightest urge I don't know, I think there was a couple of intances where my bladder didn't fully empty during a pee that I could feel. Third was something of an anomaly on the final day. I decided to go to work in underwear only, as a test. It was a pretty usual day, back to normal, tho i was being sure to fully empty my bladder each pee. About twenty minutes after one such pee I feel the urge building again much sooner than other times. Another twenty minutes and it's almost unbearable, so I decide to go pee. By the time I get to the stall it's the strongest urge to pee in living memory, and honestly seems like if anything had got in the way I'd have lost control.
I haven't noticed anything else in the two weeks after stopping the pills and 24/7, as if it never happened. And I've been logging before and after to confirm. Overall for me the effect is subtle, could very well be placebo, and definitely way less dramatic than that other anon made out, but I still have stacks of these pills so will probably dabble at this again sometime.