Cao Cao Root is an alternative name for the Chinese herbal medicine Bai Mao Root, the efficacy of Cao Cao Root in water is to cool the blood to stop bleeding (to make the blood cool and moist to prevent bleeding), clear heat and diuretic, with the effect of relieving blood-heat vomiting blood, epistaxis, urinating blood, fever and thirst, damp-heat jaundice, oedema and urinary deficiency and other conditions. Cylindrospermum parkii root is the dried rhizome of Cylindrospermum parkii, family Gramineae. It is sweet in taste, cold in nature, and belongs to the lung, stomach and bladder meridians, with the effects of cooling blood, stopping bleeding, clearing heat and inducing diuresis. It can be clinically used in the treatment of hemorrhagic fever, epistaxis, blood in urine, fever and thirst, damp-heat jaundice, edema and dysuria, and hot gonorrhea (burning and stinging pain during urination, accompanied by frequent urination and urgency, and discomfort of traction in the abdomen) and astringent pain, etc. The adverse effects of this drug are not clear. The adverse effects of this medicine are not clear, but it should not be taken by those who have deficiency of spleen and stomach (weak and cold spleen and stomach), or who urinate a lot without thirst. The efficacy of this medicine in water is limited, and it should not be used as a substitute for medication to treat diseases. If necessary, it is recommended to go to a regular hospital for consultation and treatment under the guidance of a professional physician.