The application and theoretical problem of rare earth in medicine has been the research project emphasized by the whole world for a long term. The pharmacological effects of rare earth have been found by human beings early. The rare earth used in medicine at the earliest is the cerium salts. For example, the cerous oxalate can be used to treat the nausea and vomiting of pregnancy, which has been recorded in the Pharmacopoeia. In addition, the simple inorganic cerium salts can be used as the antiseptic for the wounds. Since the 1960s, a series of special pharmacodynamic effects of the rare earth compounds has been found consecutively. It is the rare earth compound used as the excellent antagonist of Ca2+ for sedation and analgesia, which can be extensivel...