Hair loss -- PRP, Progesterone, Viviscal, Rogaine, Finesteride, Spironolactone
Minoxidil, if applied topically to the beard, will not effect hair growth on your scalp. I suggest seeing an expert to evaluate your hair loss and start non invasive options like PRP/progesterone or consider transplantation. Best, Dr. Emer
Using Minoxidil on beard and stopped
Unless you absorbed the minoxidil systemically, there should be no impact of minoxidil applied to the beard on your scalp hair. Minoxidil is a topical medication.
I've learned to never say "it's impossible." However, I would strongly doubt that application of minoxidil applied to your beard would affect your scalp hair.