Minoxidil is a potassium ion channel opening drug on the cell membrane, which can act on the smooth muscle of blood vessels throughout the body, causing the smooth muscle of blood vessels to be relaxed, thus having the function of dilating arteries. Because the artery contraction will cause the peripheral resistance to increase blood pressure, so minoxidil can promote blood pressure decline through this effect, for persistent hypertension, renal disease caused by hypertension and primary hypertension, have a more obvious effect of lowering blood pressure, often used in other antihypertensive drug treatment is not effective in hypertensive people. Minoxidil rub has a hair growth effect and is applied topically to the scalp to treat hair loss and baldness.