Will my hair grow back to normal after the shedding caused by stopping minoxidil (after an allergic reaction)?

ıf some body use minox for a long time, he or she may lost effect of it (thickening hair decreased hair loss etc ) so hair may starts to get thinning and  fall down again .. But that loss of hair probably because of irritative effects of minox.. yes after you quit to use minoxidil , hair that have fallen will grow back again

I want to help you, but it is not clear why you started the minoxidil in the first place if you did not have a hair loss problem.  At this point, I would suggest avoiding it given your reaction and seek the care of a professional who can guide you further.