It is salty, bitter and cold in nature, and belongs to the stomach and large intestine meridian. Its main effect is to diarrhea and attack accumulation, moisten dryness and soften hardness, clear heat and reduce swelling, and it is relatively harsh. It should not be used by women during menstruation, lactation, or pregnancy to avoid abortion during pregnancy; it should be stopped in the process of treatment, that is, if the symptoms are relieved after use, it should be temporarily stopped to avoid damaging the human spleen and stomach. When used clinically, it must be combined with other accompanying symptoms and used rationally under the assessment of a professional doctor.