I had some bad ED and premature ejaculation while using Rogain but I was also using Hormones as well so I assumed it was the Hormones, I thought it was strange I was having ED while on testosterone when everyone talked about their amazing sex drives while on testosterone. I got sick of my body not functioning properly and quit the rogaine and testosterone, 3 months later and I am finally horny as hell again and I blew 2 loads yesterday and almost 3. :)
The Rogaine made my hair fall out (like it was supposed to when you first use it) but the hair has not come back yet, so I regret using the Rogaine.
It was the hormones, not the rogaine. You probably (most likely, actually) used too high a dose of testosterone; the excess testosterone was aromatized to estradiol and this is responsible for your ED and other issues.