IRCT2015080319743N2 IRCT 2016-01-22 Vice chancellor for research, Ahvaz JundiShapur University of Medical Sciences Comparison of the effects of two different doses of magnesium with placebo on severity of pain of menstrual and amount of menstrual bleeding Comparison of the effects of two different doses of magnesium (150، 300 mg) with placebo on severity of primary dysmenorrhea and amount of menstrual bleeding in female students (18-34 years old) 2016-01-20 anticipated 60 Complete https://irct.ir/trial/17585 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Prevention, Other design features: Sixty participants will be randomized using blocks with 3 and 6 cells into 3 groups, (one group will receive tablet of magnesium 150mg, the second group will receive magnesium 300mg and the third one will receive placebo). This study is a double blind randomized controlled trial therefore the researcher and participants are not aware of nature of medication or placebo tablets will be prepared by one pharmacists. 3 dysmenorreha. Intervention 1: Taking Tablets containing 150 mg Magnesium once a day from 15th day of menstrual cycle to complete relief of pain for two months. Intervention 2: Control group: Taking Tablets containing placebo once a day from 15th day of menstrual cycle to complete relief of pain for two months. Intervention 3: Intervention 2: Taking Tablets containing 300 mg Magnesium once a day from 15th day of menstrual cycle to complete relief of pain for two months.