I've been on Rogaine for 3 months and have noticed the same symptoms (weak errections, loss of sex drive). I have also noticed that my penis has gotten smaller over the past 3 months (by about an inch). I never connected the problem to Rogaine because I thought the stuff never entered my bloodstream (it isnt ingested) but it doesn't matter. Somehow this stuff causes those side effects. I am looking to get off Rogaine. It is amazing for hairloss, so I don't want to discontinue unless I have something to switch to, so if anyone knows of anything else that regrows hair (with no sexual side effects), please post it here.