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Introduction: Premenstrual syndrome is the most common disorder in women of reproductive age. The causes of the premenstrual syndrome have not been clearly elucidated.In this regard, different methods have been suggested and one of them is traditional use of medicinal herbs. This study was aimed to assess the effect of valerian on severity of psychological and behavioral symptoms of premenstrual syndrome. Methods: In this double blind clinical trial, 120 students with premenstrual syndrome were randomly assigned to either the intervention or placebo groups. Subjects intervention group were received valerian capsule (530 mg Valerian root) twice a day for 2 months continuously. The control group received placebo capsule (50 mg of carbohydrate) using a similar protocol. Data collection was done via Dickerson questionnaire and the severity of premenstrual syndrome was detected before the intervention and it was compared with1 and 2 months after the intervention conditions. Data was analyzed with SPSS 22 software. Results: Data showed that there were no significant differences between the two groups before intervention but 1 and 2 months after taking valerian capsules, the severity of psychological and behavioral symptoms was significantly lower than the control group (p<0.00). Conclusions Valerian significantly reduced the severity of psychological and behavioral symptoms in premenstrual syndrome. Therefore, its use is recommended for Premenstrual syndrome.

Keywords: Valerian, Premenstrual syndrome, psychological symptoms, behavioral symptoms

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