Topical spironolactone 5% definitely gets absorbed systematically, at least in my opinion. I had problems with finasteride, stopped, and didn't take any DHT inhibitors for 6 months until the sides had finally more-less subsided. Then I started on spironolactone. I def still got some sides, but not NEARLY as bad. With finasteride I had NO sex drive, and my junk didn't work properly at all! The turning point was when I had the hottest girl I'd ever had in my bed naked and I couldn't get it going. :>( Threw away the bottle that night! On spironolactone my sex drive is a little lower, I can actually get work done during the day without day dreaming about my cube mate, but I see it as an acceptable compromise, and my junk more-less works normally. Maybe a little softer, but again acceptable compromise.
I also notice, if I stop spironolactone for 2-3 days my sex drive goes insane for a few days, totally through the roof. Then, after a week or so it settles to something between that and what it is now. I have repeated this experiment 2 or 3 times to be sure it wasn't a freak thing. Every time, same result!