Cohort Study of Honghua Xiaoyao Tablets in the Treatment of Premenstrual Syndrome Based on Target Trial Emulation Framework

The non-exposed group (patients who did not receive Honghua Xiaoyao Tablets or other targeted drug treatments) only received routine clinical observation, and no drug intervention was applied after obtaining informed consent. If patients need to withdraw from the study due to their condition during the study period, on the premise that the patients have given full informed consent, doctors shall recommend other treatment regimens in accordance with clinical standards (when necessary, first-line drugs such as selective serotonin reuptake inhibitors (SSRIs) may be selected for intervention).