Radix Rehmanniae belongs to the category of purgative and diaphoretic herbs, with the effects of generating fluids to quench thirst (promoting the production of fluids to alleviate thirst), removing vexation, stopping vomiting and inducing diuresis; while Radix Bupleurum belongs to the category of blood-cooling and blood-stopping herbs, with the effects of clearing away heat, inducing diuresis, and clearing away heat from the lung and stomach. Rehmannia glutinosa is mainly used for treating fever and thirst, stomach heat and vomiting, lung heat and cough, lung carbuncle and pus, as well as heat drenching (burning and stinging pain during urination, accompanied by frequent urination and urgency, and discomfort of pulling in the abdomen) and astringent pain. It should be used with caution for those who are weak and cold in the spleen and stomach. Radix Bupleurum officinale is mainly used in treating epistaxis (nosebleed), haemoptysis, blood in urine, haemorrhagic gonorrhoea (blood in urine accompanied by pain), gonorrhoea due to heat toxicity (increased frequency of urination, dribbling and astringent pain), oedema, jaundice due to dampness-heat, gastric-heat and vomiting, and coughing and wheezing due to lung-heat. It should not be taken by those who have cold spleen and stomach and have excessive urination without thirst. Both of the above drugs can clear lung and stomach heat and diuretic, and can be used together to treat lung-heat cough, stomach-heat vomiting and urinary tract infection. Patients need to consult a professional physician for medication, do not take medication without authorization, so as to avoid adverse consequences.