The instruction of Dahuiyin Pills does not specify that the medicine cannot be taken during menstruation, therefore, during menstruation, if there are symptoms of yin deficiency and fire exuberance, such as flushing of the cheekbones, heartburn and sweating, dry mouth and throat, etc., you can follow the doctor’s instructions to take Dahuiyin Pills. In the formula, Radix Rehmanniae Praeparata can nourish the true yin and fill in the marrow (replenishing the body’s essence and promoting the development of bone marrow); Rhizoma Zizoma Pinelliae can clear the fire of the lungs, stomach and kidneys, and nourish the yin of the three meridians; Phellodendron Bidentatae is bitter and cold to reduce the leakage of blood; Vinegar Tortoise Shell can nourish yin and submerge yang (inhibiting the rise of too much Yang by replenishing yin fluids), replenish the kidneys and strengthen the bones; and Pork Spinal Cord can replenish the marrow and nourish the yin. The combination of these herbs is effective in nourishing yin and lowering fire. It is used in treating yin deficiency and fire exuberance, hot flashes and night sweating (abnormal sweating after going to sleep and stopping after waking up), coughing, tinnitus and spermatorrhea. The adverse reactions and contraindications of this drug are not clear. It should not be taken by patients with cold and fever; avoid indigestible food during the period of taking the medicine. Drugs should be standardized under the guidance of a professional physician, not self-medication to avoid risk.