“…According to the relevant literature [ 8 , 9 ] and preliminary experiments, the project team used a combination of benzoic acid estrogens and oxytocin to prepare a rat model of PD. After an adaptation period of 3 days, except for the normal group, all rats were injected subcutaneously with a combination of benzoic acid estrogens and oxytocin to establish the rat model of primary dysmenorrhea.…”