ABSTRACTIn recent years, the research on prescription sequence symmetry analysis (PSSA) is increasing internationally, and its application becomes more mature. Therefore we collect and analyze related literatures of PSSA published at home and abroad. The research type of this method is classified as risk assessment, forward derivation, reverse derivation, method validation and so on, with examples elaborated, aiming to provide a new idea for the application of large data in drug safety research. |