I was so happy to find this thread - I am a 50 yo woman who has been using Rogaine 5% Foam for about 1 1/2 years religiously - recently I started having these 'blank out' episodes. Would totally forget something that just happened - my husband gave me a piece of pie (put it down next to me) & 5 min later I asked him where's my pie?? He didn't know what to say. The other day I was looking for my wallet and found it tucked neatly in the kitchen draw...….no recollection of putting it there. My memory is great otherwise, no forgetting important things, directions, numbers, no problems at work, etc. I don't think I have early dementia. Looking back I think I've been much more fatigued than I used to be and have been noticing the 'brain fog' for quite awhile, just not as efficient as I used to be. I threw my Rogaine in the garbage and feel better already......whether coincidence or not, I don't know. I won't look forward to my hair regrowth falling out in a few months but I'd rather have my brain (!) Very scary side effect...….