Cedarwood has the efficacy and effect of activating blood circulation and promoting menstruation. It is the dried whole herb of Cyperus rotundus or Cyperus cuspidatus of Cyperaceae family, which is pungent in flavor and flat in nature, and enters the liver meridian and heart meridian. It has the effect of invigorating blood circulation and promoting menstruation, and can be used to treat menstrual cramps and pains, obstruction in the abdomen, lumps and bruises, etc. It can be used as a decoction and as an antidote. It is mainly used as decoction for internal use. The adverse effects of this product are not clear at present. It is forbidden to use for those who are allergic to this product, and allergy sufferers need to take it with caution. This product is to promote blood circulation and menstruation, so pregnant women should not use. During the period of taking, spicy, greasy, raw and cold food should not be consumed. As a kind of Chinese herbal medicine, it should be used under the guidance of physician’s diagnosis and standardization, and should not be used blindly on its own, so as not to cause adverse reactions.