Xuan Shen is a traditional Chinese medicine whose main effects include clearing heat and cooling the blood (relieving blood heat by clearing heat), nourishing Yin and lowering fire (nourishing Yin essence and lowering fire), and detoxifying and dispersing knots. However, it should not be used in conjunction with veratrum. Xuan Shen is the dried root of Xuan Shen, family Xuan Shen, with the effects of clearing heat and cooling blood (relieving blood heat by clearing heat), nourishing yin and lowering fire (nourishing yin essence and lowering fire), and detoxifying and dispersing knots. It can be used in the treatments of warm-poisoned macules (warm-heated poisonous evils invading the human body resulting in spots and plaques on the skin), heat illnesses that injure the yin, constipation due to injury of the body fluids, laborious coughs due to bone steam, and redness of the eyes, sore throats, and carbuncles, swellings, sores, and poisonous diseases. It should be noted that, Xuan Shen should not be used with Veratrum to avoid the occurrence of mutual adverse drug effects, the specific use should also be under the guidance of the physician’s diagnosis.