Cuttlebone is salty, astringent and warm in nature. It belongs to the spleen and kidney meridians. It has the efficacy of fixing sperm and stopping the bandage, astringent and stopping bleeding (using drugs with astringent effect to treat bleeding diseases), suppressing acid and stopping pain (suppressing gastric acid, reducing pain, and collecting dampness and astringing sores. It is mainly used for treating spermatorrhea, abnormal banding, metrorrhagia (excessive menstrual flow or dribbling), blood in stool, bleeding from trauma, vomiting of blood and acid reflux; and externally treating bleeding from injuries, eczema and wet sores, and ulcers that are not astringent. Contraindications: should not be taken if there is deficiency of yin and excessive heat; prolonged use may lead to constipation, it can be used with laxative medicines as appropriate.