Brother its minoxidil. It is marketed as hairmax, minoxin and many other and in different percentages.
It is USED for hypertension(high blood pressure) and is a vasodilator(expands veins).
When used for male pattern alopecia it is applied topically onto the scalp and not taken by mouth so its effects are limited locally.
It vasodilates the vessels of the scalp which is its mechanism of action. Some inidividual may respond to it while others may not.