There is no such thing as “the most useful”. If you are in the menstrual period, you can use Shaohuayi Yuyu Tang, Shengjie Tang, and Antelope and Hook Teng Tang, etc. It is advisable to treat the symptoms to regulate menstruation, and standardize the treatment under the guidance of a doctor. 1. Shaohuayouhuayu Tang: It has the functions of warming the menstruation and dispersing cold (warming the meridians and collaterals of the human body to get rid of the coldness in the body), activating blood circulation and relieving pain (relieving pain by getting rid of stasis of blood), and it is suitable for dysmenorrhea during menstruation due to cold coagulation of blood and blood stasis, which is characterized by cold and pain in the abdomen and refusing to be pressed, accompanied by fear of coldness, and coldness of the limbs. Note that pregnant women should not use with caution. 2. Shengjie Tang: with the effect of tonifying qi and blood, it is suitable for dysmenorrhea caused by deficiency of qi and blood, which is characterized by lingering pain, like to be pressed, accompanied by fatigue (mental fatigue, physical weakness), dizziness and palpitation (heartbeat is accelerated, often accompanied by panic), and pale face, etc. It is not recommended for patients with yin deficiency and fever. Note that it is contraindicated in cases of Yin deficiency and fever. 3. Antelope and Hook Teng Soup: with the function of clearing heat and calming the liver, restoring wind and relieving pain, it is suitable for headache caused by inflammation of liver fire during menstruation period, with pain at the top of the head as the main cause, accompanied by agitation and irritability, and bitter taste and dryness of the mouth and throat. Caution should be taken when there is deficiency of yin and fluid, and when there is internal movement of deficiency wind. The above medicines are mainly for different symptoms during menstruation, whether they are the most useful mainly lies in whether they are the right medicine for the symptoms. Note that if there are no obvious symptoms during menstruation, there is no need for medication. When symptoms such as dysmenorrhea, menstrual headache, diarrhea, etc. occur, ask your doctor for a clear diagnosis, and then use the appropriate prescription after the doctor identifies the symptoms.