This is an old thread but I want to share my experience as it's very relevant to the discussion, and this is the only discussions I've found on the matter.
I started taking minoxidil for facial hair growth about 1 year ago. I saw progress pretty quickly and kept using it for about 6 months. At around the 6 month point I started experiencing severe silent reflux or LPR. I was unable to sleep with any amount of food in my stomach, and it was pretty devastating to my day-to-day life until I realized that I needed to not eat for 8 hours before bed if I wanted to get any sleep at all. I would get severe sleep apnea, to the point that I would completely stop breathing as soon as I fell asleep when laying down.
During this sleepless point in my life (about 6 months ago) I stopped taking minoxidil as I wasn't interested in trying to grow hair while my life was falling apart. Well after about two months my symptoms cleared up, and I figured I had injured myself and gotten a Hiatal Hernia while working out (which I was doing every day at the time) and figured I was maybe just getting old and need to take it easy with my workouts and not over eat.
Eventually I started cautiously exercising again, fearing that the issue would arise. I also happened to start taking minoxidil at the same time (seeking self improvement all around). Not two weeks went by, and the issue started again. No sleep. This time was worse with much more pronounced GERD symptoms. Again, I thought I overdid the exercising and was pretty upset because I didn't know what I was doing wrong and thought I couldn't workout anymore.
About two weeks ago I started feeling better. I haven't exercised since, and have begun being able to eat whatever I want again. But yesterday I used minoxidil for the first time in a month or two, and last night my symptoms completely resurged and I could not sleep because stomach acid was coming into my throat until about 6am when my food had finally fully digested.
I now know without a doubt in my mind that minoxidil has been causing these stomach problems, specifically causing issue with my lower esophageal sphincter relaxing and letting stomach acid into my throat. I am honestly very relieved to have finally found the cause of this issue and to know it is not my exercise that has been the problem. I threw away all minoxidil I own this morning, and am actually interested to see how many days or weeks the symptoms will persist until I feel better again.
Hopefully it will only be a few days, but now I have to not eat 8 hours before bed until I stop tasting stomach acid in the back of my throat. I also have to eat a GERD friendly diet with no alcohol, caffeine, or spicy food. I am very hopeful that I will never have to deal with this problem again now that I know definitively what has been causing it.
I hope this proves to be useful to others. I have spent so many hours at this point trying to understand what the hell has been happening to me these past 6 or so months and it feels relieving to finally know how to put it to an end for good. I don't even mind that the minoxidil caused a resurgence of symptoms last night because it helped me finally understand that it was the root of my problems.
I am 25yrs old, on the skinnier side, eat healthy, never had stomach issues before all of this, in good shape.