The efficacy of cypress is mainly to promote blood circulation and menstruation, should be used with caution in pregnant women, the specific use of medication as prescribed by the doctor. The herb is made from the dried whole herb of the plant Cyperus rotundus or Cyperus cuspidatus of the family Cyperaceae, which is pungent in flavor, flat in nature, and belongs to the liver and heart meridians, and has the effect of activating the blood circulation and promoting menstruation. It is mainly used for treating obstruction in the abdomen, menstrual cramps, menstrual pain, bruises and injuries, and should be used with caution in pregnant women; in addition, the charcoal of Cypress has the efficacy of removing blood stasis and stopping bleeding, and is suitable for the treatment of bleeding in the faeces (excessive menstrual flow or dripping), blood in the stools, prolapse of the anus, and vomiting of blood. The specific contraindications and adverse effects of the drug are not clear at present. The specific use of Cortex Phellodendron Bark should be under the guidance of a medical specialist and should not be used without authorization.