Introduction: Dysmenorrhea is one of the most common disorders in women, of which 60-93% of women suffer. The treatment of this disorder all over the world is using pain-killers, consuming herbal medicines and massage therapy. The aim of this study is to investigate the effects of Stachys Lavandulifolia on pain relief in women with primary dysmenorrhea.

  Methods: The present study is a clinical research which has been conducted with the aim to investigate the effects of Stachys Lavandulifolia in menstrual pain relief in female students of Toyserkan Azad University being randomly selected. The students were randomly divided into control and experimental groups each containing 45 students. Initially, the participants of intervention and control groups were requested to drink Stachys Lavandulifolia and placebo respectively at a dose of 10 gram, 3 times a day at the interval of 2 days before and 3 days after the menstruation period continuing for 3 months. The results were registered before the intervention and 1& 3 months after the intervention. The pain measurement instrument in this research was Visual Analog Scale. Independent t-test and X² were utilized in order to analyze the collected data.

  Results: The findings showed a meaningful difference regarding pain severity in intervention group after 1 & 3 months of Stachys Lavandulifolia consumption comparing with control group (p=0/001) as the pain reduced after Stachys lavandulifolia consumption.

  Conclusion: The results of the present study revealed that Stachys Lavandulifolia is effective in reducing menstruation pain and can be a fine alternative to chemical medicines and their side-effects.