Minoxidil is an antihypertensive drug, its common side effects include reflex sympathetic excitation caused by accelerated heart rate, arrhythmia, skin flushing, sodium retention caused by weight gain, lower limb edema, hair growth, to the face, arms and back more obvious, commonly appear in 3-6 weeks after the use of the drug, discontinue the drug after 1-6 weeks can disappear. Minoxidil has a prolonged hair growth, so that the miniaturized hair follicles have the role of increasing, generally hair loss phenomenon is much due to the hair follicles are damaged, atrophy, once the closure of the hair follicles will never grow new hair. With the increase of life pressure, many male patients have begun to appear the phenomenon of hair loss, therefore, many people in the treatment of hair loss with minoxidil, some patients apply the site of dryness, flaking, itching and redness, need to pay attention to: this drug suddenly stopping the drug can lead to the rebound of blood pressure. When treating hair loss, sudden discontinuation of the drug can also cause increased hair loss, so it is advisable to withdraw the drug gradually.Less common adverse reactions include angina, chest pain, headache, allergic reactions, rash, itching and so on.