There is no such thing as the most kidney-damaging herb. Herbal medicines that may damage the kidneys include aristolochia and light powder, etc. However, if used in strict accordance with the prescribed dosage, they generally do not harm the kidneys, and there is no need to avoid them for fear of damaging the kidneys. Therefore, if you want to use Chinese medicines that may harm the kidneys, it is recommended to use them under the guidance of a doctor and in accordance with medical advice. 1. Aristolochia: cold in nature, bitter in taste, slightly pungent, has the effect of clearing the lungs and lowering the qi, relieving cough and asthma (stopping cough and calming wheezing), clearing the intestines and eliminating hemorrhoids, and is suitable for coughing and asthma with lung heat, sputum with blood, hemorrhoidal blood with intestinal heat and hemorrhoids, hemorrhoids, swelling and pain. This drug contains aristolochic acid, can cause kidney damage and other adverse reactions; children and the elderly should be used with caution; pregnant women, infants and young children and renal insufficiency is prohibited. 2. Light powder: cold in nature, pungent in flavor, poisonous. It is used externally to kill worms, attack poison, converge sores, and internally to dispel phlegm and eliminate stagnation, expel water and pass stool. It is used externally for scabies, ringworm, polycarbonates, syphilis, sores, eczema, etc.; internally for phlegm and saliva stagnation, edema and dropsy (refers to a class of abdominal distension such as drums), and unfavorable bowel movements, etc. It is toxic; should not be overdosed. This drug is toxic, not to be overdosed; internal use with caution; pregnant women are prohibited.