The medicinal oyster is the shell of the long oyster of the oyster family. The efficacy of oyster is to submerge yang and tonify yin, re-calming the mind (using mineral and shell medicines to stabilize the mind), astringent and solidifying astringency (astringing and consolidating), softening and dispersing knots (softening and dispersing hard knots), and suppressing acid and relieving pain (suppressing gastric acid and relieving pain). It is mainly used for dizziness, irritability, restlessness, insomnia, scrofula (mainly refers to tuberculosis of lymph nodes in the neck), gall tumors (equivalent to thyroid tumors), and obstruction in the abdomen (lumps in the lower abdomen of women). Calcined oyster is suitable for spontaneous sweating (involuntary sweating during the day, aggravated by the slightest movement of sweating), night sweating (abnormal sweating after going to sleep, sweating stops after waking up), leucorrhea (excessive menstruation or dripping), hypogonadism, seminal emission and slippery spermatozoa, stomach ache with generalized acidity. Calcined oyster is suitable for astringency, acidity and pain relief. The adverse reactions and contraindications of oyster are not clear. If you need to use the medicine, you should consult your doctor first and use it under the doctor’s guidance, don’t blindly use the medicine by yourself.