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High-quality, large randomized controlled trials are needed to verify our findings and provide quantitative results. Copyright © 2020 Li-Na Ge et al.This study is to investigate the effect of Paeonia lactiflora extract on PMS anxiety and on expression of estrogen receptor β (ERβ), tryptophan hydroxylase-2 (TPH2), and serotonin transporter (SERT) in the premenstrual syndrome (PMS) anxiety model rats. The vaginal smear and open field test were used to screen rats in nonreception phase of estrus cycle with similar macroscopic behaviors a