Inclusion criteria:
Have no children
Participants must be between the ages of 18 and 30.
Be Iranian
According to the statement of the person suffering from a known chronic disease such as Diabetes, Hypertension, Underlying heart disease, Infectious disease, liver disease, kidney disease, Epilepsy and Malignancy
She has not taken any medication since three months before the intervention.
Do not use special drugs or supplements
According to the person's statement, she does not have any symptoms such as burning, itching or abnormal secretions from the Vagina and Cervix
Have regular cycles from 22 to 35.
Body mass index should be between 19.8 and 26.
Have a history of primary dysmenorrhoea according to the Visual analog scale during the last 6 months
Students living in Shahid Beheshti Medical Sciences student dormitories in Tehran
The amount of bleeding should be between 3 and 7 days
No bleeding between periods.
There should be no stressful events such as the death of relatives and surgery in the last 6 months.
Do not smoke or drink alcohol.
There is no history of Uterine disorders (Myoma, Bicornuate uterus, Polyps), Ovarian disorders (Ovarian Cyst and Polycystic ovary) or Endometrial hypertrophy and Endometriosis according to recent ultrasounds.
Exclusion criteria:
Take any herbal medicine while studying.
Participants do not want to continue treatment.
Kidney or liver disease or cases that, according to the doctor's opinion, should stop treatment, appear during the research.
Failure to correctly use Ziziphora tenuior capsules or placebo, less than 7 capsules in the first three days of menstruation.