The difference between Calcined Oyster and Calcined Dragon Bone lies in the difference of drug composition, efficacy and so on. 1. Drug composition: the raw material of calcined oyster is oyster, which is concocted with oyster. The raw material of calcined keel is dragon bone, which is concocted by using dragon bone. 2. Efficacy: Calcined oyster has the efficacy of astringent and solid astringency (astringent consolidation), acid suppression and pain relief (suppressing gastric acid and alleviating pain), which can be used for the treatment of spontaneous sweating (involuntary sweating during the daytime, which is aggravated by a little movement), night sweating (sweating abnormally after going to sleep, but sweating stops after waking up), spermatorrhea and sperm slippage, menstrual leakage (excessive amount of menstruation or more than one drop of menstruation), diaphoresis, and gastric pain and swallowing of acid (swallowing of acid that comes up to the oropharynx from the stomach). Calcined Dragon’s Bone has the efficacy of calming the heart and tranquilizing the mind, calming the liver and subduing yang (suppressing yang qi that rises too much in the liver), etc. It is mainly used in the treatment of palpitation (accelerated heartbeat, often accompanied by panic attacks), palpitations (violent heartbeat, frightening and restlessness), insomnia, forgetfulness, eclampsia, and epilepsy. There are more differences between Calcined Oyster and Calcined Dragon Bone, and patients should take it under doctor’s guidance.