I just wanted to chime in that I also have been experiencing severe brain fog because of finasteride use. I began taking 1.25 mg/day about a year ago without any problems. My supply finally ran out, and I delayed ordering more for about 3 weeks. When I finally decided to order more and began taking it, I began experiencing the brain fog almost right away. Stupidly, I continued use figuring that it was caused by physical/mental fatigue from working and working out too much. Eventually it got so bad, that I couldn’t even read the text on my computer screen. I would just sit there staring at words without being able to comprehend any meaning (I am not dyslexic). It was awful. I just felt like getting in bed and sleeping for about 24 hours straight. I think someone else described it as seeing the world through some sort of filter, and this description fits perfectly.
I then proceeded to take a few days off of work, as well as a few days off from working out. This didn’t help. Finally I found out about this website after doing a search for brain fatigue/fog on hairlosshelp.com.
I have since quit taking finasteride (about 3 months ago), but my normal brain function has been very slow to return. I have my good days and bad days, though. Jogging seems to help a little, but even as I type this post, it’s like I’m just doing it on “automatic” I’m having a really hard time focusing. I guess I should feel lucky that my sexual function didn’t take that much of a hit. Eventually, I will try various herbs, vitamins, etc. to treat this, but I’m really trying to see if it will go away on it’s own.
I don’t have any questions, I just wanted to add my experience. I will post again when I’m back to normal with full details of how/when it happened.