Minoxidil does not usually harm the kidneys when used topically. Minoxidil is a peripheral vasodilator, which can stimulate hair growth when used externally, and can be used to treat male pattern baldness and baldness. Topical use of this drug does not usually cause kidney damage, but some minoxidil may be absorbed into the skin, causing tachycardia or angina, etc. It is recommended that patients use this drug under the supervision of a doctor. The drug may cause adverse reactions such as rash and itching. When Minoxidil is used topically, care should be taken to ensure that the patient has a normal scalp and that it is used only topically on the scalp and not on other areas. An overdose of Minoxidil can cause significant effects on the body, which should be treated in a hospital.