Background & Objectives:�Primary Dysmenorrhea (PD) is common gynecology problem in women. It is defined as a menstrual pain that occur in absence of pelvic pathology. PD is common reason of women and girls’ absence from schoole. Pain is main complain of PD but other systemic symptoms like headache, nausea and vomiting, diarrhea, fatigue, irritability and dizziness are common. Many chemical drugs have been used to cure dysmenorrheal, but each has its own side effects.

  Cinnamomum zeylanicum has been used as an anti-spasmodic agent in traditional medicine .�

  Methods : This study was a placebo-control, triple blind and randomize clinical trial. We research. The efficacy of C. zeylanicum on severity of symptoms with PD Severity of symptoms were assessed. Data were collected by question validated questionnaires. The subjects of study were 47 single women, who sufrred from primay dysmenorrhes, They were randomly selected and their age use between 18-30 years old. We divided them two group, 26 case women in (treatment group) whom needed capsules contain C. zeylanicum and control group whom revided placebo capsules. administered as soon as onset of pain feeling or bleeding, five capsule a day and continued for minimum three days. Severity of systematic symptoms was assessed with Andersch & Milsom verbal multidimensional scoring system. Data were analyzed through by SPSS software.

  Results: The mean age of women in case and control groups were 20.69 ± 1.93 and 21.7+4.6. There was a significant differences (p<0.001) in the Severity of pain between two groups. The severity of all the systematic symptoms decreased in both groups, but this reduction was not significant between two groups. No significant difference was seen for systematic symptoms between twogroups. In this study, had not been observed any side effects by using of C. zeylanicum .

  Conclusion: The results our study should that C. zeylanicum�can be effective in reducing the severity of dysmenorrheal, but C. zeylanicum has no sufficient effect on relief of systematic symptoms accompanying with dysmenorrhea.