Danshen-Jiang-Fu Granule Prepared by Danshen From Different Producing Areas for Primary Dysmenorrhea

Inclusion Criteria: * meeting the diagnostic criteria of primary dysmenorrhea in the Primary Dysmenorrhea Consensus Guideline; * meeting the diagnostic criteria of Hanning-xueyu(blood stasis due to cold accumulation) Zheng according to Gynecology of Chinese medicine; * with regular menstrual cycles lasted 21 to 35 days, with menstruation lasting 3 to 9 days in the last 6 months; * course of dysmenorrhea over 6 months; * experienced menstrual pain scoring varying from 3cm to 6cm on a 10-cm VAS during the baseline menstrual period (one period prior to present menstrual period with treatment); * without history of pregnancy; * with agreement of informed consent and a working phone. Exclusion Criteria: * history of abdominal surgery; * with other acute or chronic painful conditions diagnosed or suspected; * use of hormonal contraceptives, or intra-uterine device; * use of analgetic drugs or other analgetic treatment in the last 2 weeks; * known allergy to Danshen (Salvia Miltiorrhiza), Paojiang (Roasted Ginger), Xiangfu(Rhizoma Cyperi) or Wuyao(Lindera Aggregata); * prone to allergy in daily life; * who can not complete treatment adherence to the protocol; * attending in other trials in the last 3 months.