The study titled "The Effect of Yarrow's Extract on Premenstrual Syndrome in Female Female Students in Dormitory of Qazvin University of Medical Sciences" will be conducted as a randomized clinical trial on female students residing in the dormitory of Qazvin University of Medical Sciences in 1395. In this research, all female students living in dormitories of Qazvin University of Medical Sciences as a research community. Girls living in dormitories of Qazvin University of Medical Sciences, who have moderate and severe forms of premenstrual syndrome and who have the conditions for entering the study, will be included in the study if they are willing to participate in the study. In the case of people who meet the conditions for entry into the study, the Temporary Pre-menstrual Diagnosis (PMS) form will be provided and collected. Depression tests will be provided to them at least 5 signs of the symptoms. If the subjects are natural and non-depressed on the basis of the score, they will be selected as the research unit and written consent will be obtained for participation in the study. Then, the form for registering the daily symptoms of the symptoms will be completed for two consecutive cycles by the samples. In case of self-treatment, the sample will be excluded from the study. The data gathering tool in this study was a modified PSN screening screening questionnaire, which shows the severity of the disease as necessary and effective in the life of individuals, and is more practical and time-consuming from a two-cyclical chart. To be more economical. This questionnaire consists of two parts of the symptoms and the effects of symptoms on individuals' lives. (31) Companies will be randomly divided into two groups. To the intervention group, an average glass of Yarrow's extract containing 300 μg of effective ingredient in Qazvin Pharmaceutical Company (Qazvin) will be given three times daily for seven days late in the luteal phase. The control group will receive their routine treatment. Physical and psychological symptoms will be measured separately before intervention, one month after intervention, two months after the intervention and three months after the intervention. Samples will be required to report any side effects.