The efficacy of leucaena leucocephala root boiled in water is to cool the blood and stop bleeding (make the blood cool and moist to prevent bleeding), diuretic and clearing heat; the role is to treat blood heat paranoia (the heat evil causes the blood to go out abnormally), and the heat evil caused by the internal offense of the disease, but a single herb boiled in water to play the efficacy of a limited number of diseases such as need to be used in conjunction with other medicines to treat the disease. The root is the dried rhizome of the grass plant, Imperata cylindrica. It is cold in nature, sweet in taste, and belongs to the lung, stomach and bladder meridians. Its main effect is to cool the blood, stop bleeding, diuretic and clear heat; mainly used in the treatment of blood heat caused by vomiting, epistaxis, blood in urine, fever and thirst, jaundice, swelling, hot lymph (burning and stinging pain during urination, accompanied by urinary frequency and urgency, discomfort in the abdomen), astringent pain and so on. Adverse reactions and contraindications of Bai Mao Gen are not clear. It is contraindicated for people with deficiency of spleen and stomach (spleen and stomach weak and cold), and people who urinate a lot without thirst. If you need to use Bai Mao Gen, it is recommended to choose the medication under the guidance of a professional Chinese medicine practitioner, and not to buy it on your own, so as to avoid the medication not being suitable for the symptoms and affecting the therapeutic effect.